Just catching up with this rickman and asking her outright has got you nowhere! It is really strange, but you've now put the ball in her court and she isn't responding. I can't see what else you can do. It's really weird. You'd think with that opportunity, she'd at least give you a clue as to what is going on!
Haven't read all the posts, but maybe as Freckle has said, she wants to be needed and may have found another more 'worthy' cause. I don't know what to say really, but I'm sorry it's making you feel so miserable - I would too, but maybe you should just try to put the episode behind you and make some new friends (like us - lol - cos we're lovely and don't act weird), or just concentrate more on the friends you already have.
I hope you can move on from it, but I have no idea how to deal with it as far as the kids are concerned - that is a tricky one.