It sounds like she had some outside reason for acting erratically. In other words, it had nothing to do with the two of you, directly. It could have been another guy in her life or it could have been a conversation with a girlfriend over a bottle of wine where the girlfriend told her not to have a long distance relationship and the wine made her unfriend you. I’m guessing — but I’m also suggesting you don’t make too much of it because you just don’t know, and you have a delicate relationship because of the distance and the newness. So don’t get freaked out. Go back to things as normal, and when you do see her, you can mention it, if you want to, but if all else is going well, don’t make a mountain out of a molehill. That she got scared is one thing but that she is back on board is more important, given everything else. 😉