What is the ruling on a girl going for medical treatment without the permission of her parents who forbid her from doing so, given that her health is being harmed and her life affected by the illness?

The matter is as we previously explained to you: obedience to parents is not obligatory in matters that harm the child. If you are asking about the doctor's report and the female doctor performing the surgery under his supervision, then the rule mentioned in the referenced fatwa applies. Obedience is obligatory in matters that involve benefit and no harm to you. However, if there is no benefit or if it results in harm to you, then obedience is not obligatory.

In treating a woman, a woman like her, whether Muslim or non-Muslim, should be preferred. If no such woman is available, then a Muslim male doctor should be preferred over a non-Muslim one. It is not permissible for a male doctor to perform this operation if there is a skilled female doctor capable of doing so.