What is the ruling on a female doctor assisting a fornicating girl in aborting her pregnancy or taking birth control pills? And how does she expiate for this action if it was wrong?

The questioner was negligent in two matters: First, informing the woman of the possibility of pregnancy, even though some scholars prohibit abortion even if it is a nutfah (zygote). Second, guiding the woman to use birth control pills, which is considered an encouragement to immorality. She must repent to Allah, and no specific expiation is required. What was obligatory upon her was to advise the woman and invite her to repent from this heinous act.