I would be beyond pissed. What would you do?

So a little background on this situation is that her mother said that she isn't allowed to have any boys over at the house unless she or her husband are there. Doors must stay open at all times and the boy is to leave by 10pm. When they go out, she has to tell her mother where she is and has to be home by 10pm as well unless there's a special occasion of which her mother is usually understanding. I thought these were pretty reasonable rules, especially for a 15 year old girl. Also, according to the school attendance, she has been skipping class but she won't admit to it, she says that the school is wrong, but her grades have also been falling. She was caught trying to sneak is this boy at night one time and grounded for 2 weeks in which she wasn't allowed to have anyone over, she wasn't allowed to go out, she also had no phone or internet, which I think is also very reasonable. Her mother is very patient and understanding. She's one of the sweetest people I know. She just wants what's best for her daughter (as any parent would) but speaking honestly, I can't stand her daughter. She's always had an attitude and she's never been very appreciative of anything.

So back to the question. What would you have done? How would you feel?