Should I homeschool my teenager?

My daughter has struggled going to public school since we moved to this town 3 years ago. Her grades start out fine, but then her attendance starts to slip, she has had some health issues in the past and also a few girls in her school are making it hard for her to want to go. When she is home with me, I notice that I can get her to understand better in a one-on-one environment. She gets very moody and sometimes mean (verbally) in the morning when she knows she has to go to school. I fear that going to school is actually effecting her health as well. Her doctor has given her a preliminary diagnosis of being bi-polar. How can I start homeschooling her before she decides she wants to drop out?