I don't really see how it's lying if what you're saying is true that she doesn't require you to tell her as long as you clean it well. Parents are people, too, though, with issues and faults and imperfections. She seems to realize she overreacted initially, albeit a little late. That is unfortunate that you weren't able to go with your friends, but honestly, if I had wanted to go badly enough, I'd have personally managed some way.