Depending on where she is going.
I moved to Aus when 18/19 weeks pregnant. I just looked up my local gp - explained the situation and they asked me to come in.
I was a public patient - so was referred to the local hospital and I did something called shared care.
Shared care is basically where most check ups except for about 3 or 4 of them are done with the GP ( what would have been midwife appts in the UK) and then had some appts with my named consultant at the hospital.
The other option is to do solely midwife care at the hospital - so going to the hospital for all of her appts.
She can also go as a private patient where she would be referred to an obstetrician and see him at every appt.
1st thing So 1st thing they would need to do is get to Medicare office with their passports containing their visas. They will be given a medicare number - necessary.
She can then find a GP and they will refer her on from there.
I found shared care so much easier than traipsing into the hospital - especially when I really did not have anyone to take dd1 for me. ( and again when having dd3 - so much easier to get to see GP without having to wait for ages etc at the hospital.)
With regards to payment - hospital appts not charged - but will still need a medicare number so Medicare is charged iyswim. Depending on doctor's surgery - some are bulk billing practices, others you pay and then claim money back from Medicare - don't get all of it back but get most of it.
She also needs to check with safety with regards to flying so early in her pregnancy - especially long distance.