However, in your situation, your DIL doesn't seem to like it or encourage it, she just doesn't know how to deal with it. How sad if her solutions is to cut and run.
And the religious thing is sure a hot topic. Personally it makes my blood boil to know her parents are quoting the bible and destroying the marriage simultaneously. That's the height is hypocrisy in my book. (Hope I didn't step on any toes.)
We need an 11th commandment. Prissy is really good at that kind of thing. How about: Thou Shalt Not Meddle?"
It must feel awful for you to be watching all of this play out and not e able to help. It's theirs to deal with or be conquered by. Blessings, Luise