Aww, honey I'm sorry that you're having to drop.
I REALLY hope this does not sound at all rude or inappropriate.... But WHY would you have to have a 9:00 curfew when you are in college? I didn't even have a curfew that early when I was in high school.
I honestly think you should keep trying to talk to your mom about this. I know I don't know the whole story, but it honestly just does not sound reasonable.