You have my sympathies, I'm sure this is a stressful and difficult time for you.
I think your instinct to insist on seeing a paediatric gynaecologist is abo****ely correct. I would insist on a referral to one, preferably one that works out of a children's hospital - I think the nearest to you might be the Mater Children's Hospital in Brisbane, but I am not 100% sure. You can get some financial support through the IPTAAS service, which your GP or local Centrelink office should be able to tell you more about.
Poor little bubba
I just wanted to wish you all the best. I can only imagine how stressful & scary this is for you. I hope everything is there & it can be fixed easily... & I also hope later in life she has no complications due to this (concieving etc).
Good on you for not just accepting the adult gyno & going with your instinct for a paed gyno.
Good luck & for you too!
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