Just a thought, but she may have not wanted to talk because she was just not in the mood for conversation. It's easy to think it was because it was YOU, but she may have turned away from anyone she knew. She may have been upset about something, unwell, in a hurry, depressed etc.
Try not to let it get to you. We have all been in situations like that, and it's not worth getting yourself worked up about. She may be feeling bad about avoiding you now anyway.