Not from the perspective of a human being who has a male appendage!
Sure, the procedure can be done (and would be done) under anesthesia, but healing takes longer than the anesthetic lasts. And the change to a very special body part – the loss of something that has been with you literally your whole life to that point – would be disconcerting, to say the least. It’s a huge physical violation.
For a female it would be like genital mutilation.
Whether she’s crazy or not, I’m with the mother at this point in the kid’s life.