It is important that as a parent, you create a flexible environment that supports your teen, and provides her with the opportunity to grow into a self-reliant young adult. As a teenager, she will think at times that she has all the answers, and not need you. However, she will be happy to have you as a "safety net" when she realizes she does not have all the answers. This can include how well she is doing in school.
Obviously grades are important but sometimes the quest for good grades can become an obsession, or not taken seriously enough. As parents, we can fall into the common trap of measuring our child