It’s a logical application of your view which is: I get to have surgery to mutilate a perfectly healthy organ because I wish to.
It’s irrelevant about the cutting a part off vs severing a connectiong, but…
what if she wanted to snip her spinal cord–that’s the equivalent of a vasectomy, right?
Incidentally, this is not merely a hypothetical. There are indeed folks who wish to do this.
ibtimes.com/chloe-jennings-white-woman-body-integrity-identity-disorder-wants-surgery-be-paraplegic-photo
If you wish to sever your vas deferens for your own personal reasons, why would you oppose your daughter wishing to sever her spinal cord for her own personal reasons?