I see your point but I think the parent didn't mean "ask" as in "told", it's obvious (at least to me!) that such decisions are taken by the woman only. I interpret this as, "I take the full responsibility for not making you pregnant. You can relax now and you don't need to increase the risk of getting cancer out of fear of pregnancy."
I wonder if it's not also the comment format, that is not a full retranscription of the discussion they had, that brings this "ask" to an autoritative verb. The discussion may very well have been "I asked her if she wanted to get off the pill", and the parent took a shortcut on writing.
I did this, and I'm now vasectomized, but even without this operation, the deal was always "I think this may be harmful to you, I would suggest to stop taking it, but that's your move. If you're taking it for contraceptive reasons, we can figure out something else". But this makes for a way longer comment, when you are replying quickly to a topic to provide an opinion on a subject.
