https://www.aap.org/en-us/about-the...inal-Say-is-Still-Up-to-parents-Says-AAP.aspx
Honestly I dont care if youre for circumcision or against it... what anyone chooses to do or not do with their sons penis is purely up to them ... but this article from the AAP clearly states that they believe insurance should cover it which is what the OP was talking about not whether you think it should be covered/ done or why .
True, but if her insurance won't cover it, there's really nothing anyone can do about it.

The OP will just have to pay out of pocket for the procedure, which shouldn't be a big deal if that's what they want to do.
Of course it's up to the parents, but since it is a cosmetic surgery (and insurance doesn't cover cosmetic surgery unless it's medically necessary) that's the reason most insurances don't cover it. There's really nothing anyone can do about that.