Well she will have sex.
She already has.
Does she know, about sexually transmitted diseases? Have the Doctor tell this as well. Show her, pictures online, about STD's, and the FACTS.
Maybe this will make her think twice.
At this age, I don't think the idea of getting pregnant, is enough of an incentive to stop having sex.
At least she told you and the Doctor.
Make sure you maintain open communication with her about her activities and body.
Kids this age, do not think, wisely enough.
The human brain is not even fully developed until 26 years old.
She has to also, care about her body, and about her self-esteem, and in relation to boys. And how to stand up for herself.
Boys, well they are just getting sex. Boys this age, do not tangibly relate to the fact that they can get a girl pregnant.
Don't know the definitive answer to this.
Also, kids this age may not have a fully developed Endocrine system. And how will birth control pills, affect her health? Is she having a period? I assume so.
Sit down with the Doctor again, or as many times as you have to. To make a clear decision.
She will continue to have sex.