D.M.
While it's possible that it's just normal teenage angst.. it's also possible that there is something bothering her. I'm a little concerned that you say she's tired all the time. That could be that she's not getting enough sleep, or needs more than she realizes at this all-too-hormonal time of life... but it could also be a symptom of many medical conditions.
If the doctor sees no medical reason for her behavior and sleepiness, perhaps it's wise to seek counseling..
Have you tried asking HER if she'd like to have someone to talk to like a counselor? Many young people feel uncomfortable telling their parents there are things that they don't want to discuss with a parent so they don't ask for counseling. However, if you approach her with the idea of having someone to speak to outside of the family, she may jump at the chance.