Don't ignore her because that would make you seem like an @$$. Instead, treat her like a roommate. If you had a roommate, you wouldn't care if they were happy or not. You would let them alone and deal with their own things. That's how it is.
"Everything was status quo and then all of a sudden this happened. That's why I chalked it up to her hormones."
It ain't from her hormones. She's been slowly and purposefully distancing herself from you and your family. When she first agreed to Retrouvaille, you should have attached a list of things that both you and her had to work on prior to going. Again, both parties have to want to kind of work on it. Right now she's acting like a juvenile who is going to something they don't really want to go to. Sure she may have a sudden revelation, but chances are that it's not going to happen.
Let me ask you then. If things don't work out at Retrouvaille, what do you plan to do? You've put all your eggs in one basket.
First thing you need to do right away is to command respect from her. She may not like going, but she doesn't have to act like a b*tch to you before you go. Appeasing her isn't working. Do something different. Get your balls back from her. Be compassionate and understanding, but don't be a chump at the same time.
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.