Did you try to explain it to afterwards, or talked to her again? If you haven't, then you should do that. Try to clarify the situation and be calm. Don't come across as aggressive - you might freak her out. I think the best way is to ask her out. Go to a nice restaurant and talk to her.
With a different environment, she might respond with an explanation this time. But be ready for anything. Take everything she says coolly. Good luck.