From a girl's point of view, it really does sound like she's brushing you off.
If you really feel that you didn't do anything wrong, I would send her one message explaining everything (kinda like you just did
) and let her reply to it. It's up to her to make the next move, as long as you've tried, told her the truth, and explained everything.
If she really is going through some family issues, she'll eventually come to you to talk about them... and if she doesn't, that's her choice and I guess its something that should be respected.