OK. Good. Now time to quit losing waking hours over it.
Part of STBX's "issue" is likely the emotional neediness/demands she feels from you that she does not want to meet. Feeling your neediness/demands is, in classic DB-style, going to make her more distant and more resistant to giving you anything, including the time of day.
Let go Wii. Drop the expectations. Quit watching for insults and for the next slight. Assume instead that she is no more giving you slights than a person in a grocery store who walks by you without acknowledging you.
You keep wanting from her that which she doesn't want to give, and it is making it hard for her to give you anything, including decency.
I wonder what you are getting from these family trips and if they are good for you?