I would encourage you to focus on what changes you want to see in your daughter's behavior. (Forget about attitude. All teens have one and it's best to ignore it.) What are the consequences for her low grades? What limits on her social life are imposed by you? All of us who are parents need help at some time or another in setting consequences and boundaries. I encourage you to enroll in a parenting group; check out websites or check out books from the library on working with difficult teens.
Will Parochial School Help Daughter's Behavior?
Middle School Expert Advice from Connie Collins