Yeah it might mean it's over. But it could mean she's upset too. If you want to get back with her, try approaching her slowly, and begin a normal conversation, so that she feels ok in your presence. But if she starts walking away, she's angry at you.
Just try talking to her. What's the worst that could happen? Just say what you're feeling. If she says she needs time, give her time, say about 1 week, it would be enough.
Just don't expect her to come running back to you, you have to face the worst, if that's the case.
Don't ignore her though, that would be rude, even though she's ignoring you.
I hope this helps.
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