me: "no offense but im not paying to eat food if we're going to be watching the clock the whole time. and you could easily have said something yesterday and then this wouldn't even be an issue. you should just go to the party now."
Ever notice that when someone says "no offense but..." the next thing that comes out of their mouth is offensive?
I'd say you were a bit rude. I would apologize if I were you, but you obviously dont want to be friends with her so I would just tell her that.