Hi Pam and welcome....
apparently your MIL has always gotten her way by acting out...well I'm sorry, life isn't always fair, and we can't always have our way...
First I would suggest that you and hubby get on the same page regarding this. You are grown adults...and you need to say no...and that is that...if other family members call you about this, tell them right out, you love them, but this is between you and her and that MIL has to stop putting them in the middle of all of this just to get her way, period. Say the same thing to everyone that calls on her behalf.
Yanno, many inlaw problems start, b/c one person wants they're way...and that's silly to fight a lifetime war and not give in...so, your going to have to teach MIL...she can't always have her way and it's about you and hubby, not appeasing her....
You sound fair, understanding and very calm about this...your husband is very lucky you don't throw in the towel when it comes to his mother...
Life is to short and people are way to busy today to cater to someone's every whim like this...it's about you and hubby....and where you want to be, where you want to go, and who you wish to spend time with.
Don't allow this woman to bully you into giving her, her way, and go, for God's sake, spend time with your family...regardless of whether she knows the word share or not. Everyone needs quality me time...if by themselves or with the people they wish to be with....this will cause much resentment on your part eventually and husband isn't being fair to you by giving MIL her way. Your grown adults, and your hubby has to understand, you no longer have to appease family, you do and will have your own family now...it's your life, not theres.
You know what you want to do, and what you have to do...stop trying to gain everyone elses approval in that family for your actions...you are never going to be able to please eveyrone...this is a very immature selfish woman....and it's high time you and hubby stand up to her together....and be firm, and never give in...if you decide to do something, no matter how badly she acts out, don't either one of you give in...
It's about you and your happiness together, not about her...and Pam, you sound like a very fair person...you've given her the benefit of the doubt....she is acting out like a child to get her way...that's all, she'll get over it, and if she doesn't so what? To bad....
Why are you not standing your ground? Do you both fear being estranged from the family? How long has this been going on? Hubby must realize, he married you...you are his wife, and it's mutual all the way here....does he feel sorry for her when she does this? And why haven't you gone to be with your own family? They deserve to be with you and you deserve to be with them. Here is a suggestion....that maybe you can toss around....
My neighbor and good friend told me, that Christmas dinner, got to be a problem with her son's and DIL's. Not because they wanted to be with DIL's parents, but b/c they wanted to spend Christmas Day at home, with they're kids, opening they're gifts and having they're own Christmas dinners...they wanted to start they're own traditions. Well, my neighbor said, "fine, how bout we all make a date from now on, to get togher the Sat. before Christmas, here, for dinner and gift exchange? They agreed and it worked....
So, depending on your schedules, you do have several options and if you wish to start your own traditions instead of running all around, do so.
Yanno what I started to do...I went away over Christmas....it was my vacation, I didn't at the time, feel like running around to everyone's home, all I wanted to do was sit and relax...(I can't stand schedules or feeling like I have to be there) so, every Christmas, I booked a vacationand it was marvelous....my girlfriend and her husband rented a cabin, packed the kids sleds and went to the mountains for Christmas....and those were the greatest time in my life...of course older sister used to really complain, but tough...now my younger sister and her hubby are not always there for Christmas...she said to me one time, I know older sister isgoing to talk about us and complain...and I said, "so what". And when older sister did start to complain to me, I said the same thing, "so what". "It's they're choice, they're life....get over it..." and she did.
Sometimes you have to tell people right out to get them to realize, just how unreasonable and stupid they are sounding and acting, just b/c they don't do something. I'm sorry, but your situation is in dire need of a 2 x 4, which you gotta hit people with sometimes to get they're attention...

Not really...however, all kidding aside, this woman sees it upset you and so she knows she's manipulating you and your decissions. Is she by herself, divorced, lost her hubby? Don't feel badly if she is....yanno, you can always invite her to go with you to your parents home if she is single...and you feel guilty about leaving her? However, if she says she doesn't want to go, then so be it, then you two go...
So, this to, can be worked out...however, you and hubby need to stop feeling guilty or tying to appease this woman who has no other thought in her mind then she wants her way.
And as far as anything you plan, if she doesn't follow through and calls at the last minute, leave her out...she will in fact not do it again...if you do so.
It's like training a child...no words exchanged other then to tell her, well, you weren't there, you didn't respond, so we figured you were not coming, we're not going to second guess you, if you don't respond, that's it...period. Not mean, but matter of factly...don't get into a verbal argument...she is going to have to change, and if she takes this further, then demand she see a counselor along with you both....however, please yourselves.
We had new neighbors move in...these people are in they're 60's. They were in the process of unpacking and could not find they're wine bottle opener so they came over and asked me if they could borrow mine, and he said, "by the way, don't tell her mother, she doesn't approve or understand drinking wine?

" Yanno what, tough, she may not understand or drink wine, however, it is there perogative that they do and none of her business....boy that stuff makes my skin curl....that grown adults fear what they're parents will say if....sheesh? Someone needs to tell that particular parent to bud out...period. LOL
So, keep us informed and wishing you the best...I know it's difficult but once you start, it will come natural to you...and please print up these suggestions and let your husband read them over...he needs to be firm and very instrumental in this...and needs to remember, once you both decide something, he can't cave.
Hugs and my best
Creme