Why is my female friend ignoring me/distancing herself from me?

I've known her for seven months now. We haven't met so we would communicate through facebook, text, snapchat... We get along very well, talking almost every day about everything and nothing. When I told her I liked her, it was a bit more difficult, but eventually we went back to normal.

But then suddenly we're not talking as much anymore. She stopped liking facebook and instagram posts of me. She stopped initiating conversations. When I start the conversation, it usually ends after two or three messages. She hasn't even replied to my two latest texts...

We're both studying now for upcoming exams, but I wonder if she's really that busy... But that doesn't explain why she would stop liking fb en instagram posts (I can see she still does it with other people).

She went through a very rough break-up a couple of months ago, maybe that's relevant. But she knows she can tell me anything, which she has done so in the past...

I have no idea what is going on or what I can do... I miss talking to her.
I would appreciate an answer other than "let her go", because I'm not planning on losing her.