I would be super annoyed too. She had no concern for your plans and ditched you for a man. That would be bad enough but knowing she knew far in advance and only let you know last minute, that makes it even worse. Completely disrespectful.

And what's this shit about her being the one that's hurt. What is she on about? What the fuck has she got to be hurt about?

Ugh. I'm sorry. It's really hard to lose a friend. Maybe this isn't the end. She might see the light and apologize. I hope she does.