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I don't feel you should beat yourself up about it.
As far as I can see from a brief rummage around the interwebz, the haemgioma tissue doesn't perform any bodily function. It's just there. And in the extremely unlikely event that she would regret removing it at a later point I am sure one could theoretically recraft something that would look similar to her pre-operated state.
In comparison, you can't undo a circumcision. Vital functions will be lost forever.
No not pierced ears. It’s purely aesthetic, plastic surgery to make her ear more “normal” looking due to a haemangioma.
My point is parents do what they think is right and best for their kids on the whole within cultural and societal norms which of course change.
To me a ban seems worse than better regulation and safer practices.