The term 'bad friends' is a relative term and one can conclude anything as per their views on good and bad. As far as teenage is concerned, yes I understand how grave this problem could be for any parent, and it cannot be solved in a day or two. This requires a lot of work from both the parents as a team. You have to understand that the more strict you try to be with a teenager, the more they're likely to rebel. You now have to alter your ways of dealing with your daughter. Try becoming her friend and gradually her confidant. If you keep finding faults in everything she does, she'll move further away from you. Yes, I understand you're a parent and that you have to tell her where she's wrong, but do that tactfully, without hurting her or offending her. Also compensate by telling her what you admire about her. Grow this bond of mutual friendship, and only then can you deal with her. All the best!