Birth control

I took my daughter for her physical for school 2 mos ago. The doctor asked her about her menstrual cycle. My daughter told her that she has heavy days sometimes with really bad cramps. Her doctor suggested birth control pills to help with her cycle and cramping. My daughter is 15, not active, but she came asked if we could make an appointment for her to get the pills for her cycle. I need advice. Im just on the fence about it.