Father Joe, I need your help

My daughter scares me... She has these days when she gets so depressed about life. She won't go to talk to anyone, says no to drugs and it is geeting out of hand. I want her to be happy. But, she says there is not anything that makes her happy. Not even world of warcraft a video game she plays endlessly online. Bret and I have done so much for her, but seems to not appreciate any of it. Just getting her through school is struggle for us and her.. Why, Why is my daughter so terribly miserable???..I love you KB my baby girl ....................