So sorry about your BIL. CMM has been having a difficult week
As for Wild Girl - sounds to me like what we have here is two Love Avoidants in a relationship! You may want to google Love Avoidants. Fairly typical is you will have a great time together (Love Avoidants need love too, as my friend once said, and they can be very seductive) and then you don't hear from them for a while once their needs for intimacy have been met.
Exhibit #1 - when I was dating (ok, call it "seeing") my old Love Avoidant friend earlier in the year. Our time together was great - great conversation, great sex, lots of laughter, he's very compatible with me and I enjoy him a lot. But the minute it seemed like I wanted anything more (I didn't - my expectations of him were set appropriately low as I knew him from a previous round of dating) - but I think me inviting him to share a fancy hotel room that I got for free while teaching at a conference a short drive from where he lives spooked him. So he has ghosted me since! God bless him, I know he suffers from periodic severe depressions and it's possible he just sunk into one of those. But I think it's most likely that he just felt himself starting to care a little too much about seeing me and had to run back into his cave. I don't take it personally at all.
Just pointing out that IF she is a Love Avoidant, things might have been getting a little too good and that cruise might feel like it's a big expectation.
Exhibit #2 - a guy who I call my "Coffee Buddy", not someone I dated but used to chat with at Starbucks in the mornings before work - he was a Love Avoidant and explained to me once why he doesn't usually call a girl for a date until the day of or the day before. He said "If I make a date on Monday for Friday night it hangs over me all week like a dentist appointment. What if I don't feel like going out on Friday when it rolls around?"
So I guess my point is this: Maybe she's just an avoidant in which case this is just normal behavior - get a little too close and pull back. Doesn't mean she doesn't like you or enjoy your company. I'd quit making ASSumptions and just take it easy, see where it goes.
