Hi curious and welcome. I'm sorry to hear about your sister but there is a lot of support and info here for you.
We have our in-house Aussie, Larry, here on this site. His AN was treated by Dr Chang at St Vincents in Sydney. I know of others from your area (I thought there was someone here from Melbourne but the screenname escapes me.....), but Larry is a good starting point as well. You can send him a "PM" (private message/email) here on this site by finder his user name in the Profiles section and clicking on his profile (on the bottom, you see an option to send a PM).
Please tell your sister I send wellness wishes... and again, welcome to you both.