Let me elaborate, my reply sounds like some arrogant wanker. But I speak from experience doing this in non-covit times. If you search my post history you'll find the story I can't be bothered typing it all out again. I've done the 14 day hotel quarantine coming in to Aus, when the govt was still paying the bill mind you(for the record it's $3000 now and yes you pay alone), you can't come out the room at all for the full 14 days, if you smoke you don't anymore.
The issues I speak of are specific to Western Australia, however most of them will apply Australia wide:
This is your biggest problem: there is a travel ban on right now
https://www.smartraveller.gov.au/ so citizens and residents can't get out of this country, if it's an existing relationship (IE marriage) you MAY be able to throw a lot of money at the issue and bring the girl, but the regulations on who can enter/exit Australia right now are the strictest ever.
Guruda just started flying Perth to Bali/Bali to Perth again - it's $1500 via Brisbane with a transfer to get there (so you're detouring many hours in the wrong direction) but there is currently no other way. Around $1500 to get back, no holiday visas just returning citizens/residents straight to hotel quarantine. So what used to be as little as a $250 flight - flight plus quarantine = $1500 + $3000 = $4500! There is only 2 or 3 flights a month too.
If you really trust the girl, you're best option is probably to offer financial support and try to keep up comms like video calling daily etc until you can reunite. It sucks I agree, checkmated in the same delimah myself.
My personal view is there is a lot of political stuff going on right now with everything happening in China and Hong Kong, I hate to say it but the route to Indonesia will likely be near the bottom of the list to open back up to pre corona levels. Asia is perceived as "high alert" and "don't trust" and it just unfortunate that ordinary citizens like you and I cop the fallout from something we have nothing to do with.