only way I know to contact her is by writing a message under one of her articles on her web site. As I said, she only just came back out of hiding. She used to have a twitter and a facebook but I don't know if she still use them. Well I just looked and it seems she's posting on facebook again.
you can find her here though:
https://fionabarnett.org/
https://www.facebook.com/fiona.barnett.940
https://pedophilesdownunder.com/
and I'm posting her documentary too