Where are the boxing gloves

Actually I've met the fmil once and found her to be quite nice. We also seem to have quite a bit in common, two sons the same age, etc. The fmil and I are probably pretty close on our views, I may be considered a little more laid back, and fully aware of the fact that her son and my daughter are not the perfect angels that they are trying to portray

She tends to think more along the lines of, if I don't know then it's not happening
The only area where my dd has expressed concern is the fmil has stated a couple of times that they would like to host "a really nice" rehearsal dinner. I know that the kids were thinking more of a casual dinner at my house where they could turn it into a pool party and save money that might be floated over to the wedding because without doubt there will be a shortage of funds.
Now I could be wrong but I told my dd that I THOUGHT that this is not a case of fmil not listening because no one (her son and fdil) has clearly and fully explained to her what it is they would like to do. I tried to explain that she has been left to assume that the rehearsal dinner will be the only part that she'll be allowed to freely participate in. I'm also making the assumption that she is speaking about a nice/formal rehearsal dinner in part because well by traditional standards this is where she will be judged as the mother of the groom.
The truth of the matter is... the kids are only looking at a semi-traditional wedding... I had made mention at our first meeting that my dd and her son have decided to have dd's best friend officiate the wedding.. the woman looked at me like I was have crazed. LOL at that point I said ok, all information such as that is coming directly from my dd and her son. I think that if fmil has more time to sit and talk that she will see that these two have a pretty clear path they are choosing to follow.... the goal that the young couple has is to get fmil to roll some of the funds that she earmarked for the dinner into the funding of the wedding. I don't know if it's right or wrong, but I gave my dd and fsil a set amount that we will spend on the wedding, and it's not quite enough to cover the whole thing... but they have options.. set their priorities, scale back..or come up with funds of their own.
I will consider the weekend successful if the fmil leaves understanding that no one is viewing this as 'my daughters wedding' but as their wedding. DD told me recently that they would like to change the traditional invitations that state the parents of the brides names and instead use more encompassing terminology. I fully agreed.. the only thing I would ask for is a front row seat.. the rest is about them.