Hello amandalouise,

(thank you for letting your child decide about the surgery. It's sadly not that common)
I think it would be a good step to bring not only you, but also your child in contact with other intersex people. They understand your child the most and can give you tipps how you can be a supportive parent.

Here is an organisation that is run by intersex people (not only) in NYC Intersex Campaign for Equality ? The United States affiliate of the Organization Intersex International (OII)
They have a lot of links to other resources as well.

Wish you and your child the best