G'Day AussieSammy, I'm not a big believer in agents. A lot of the time they cause more trouble than there worth. You may end up paying a lot of money for someone to just fill out a few forms for her. In my opinion the agents won't be able to push it through any faster than normal.
If she can get herself to the Indonesian Immigration Office they can tell her everything she needs to do and all up it should cost her about Rp.350.000 for the passport.
Here's what she'll need to do to get the Australian Tourist Visa:
Applying for visas in Indonesia - Australian Embassy
The biggest problem you'll have is if she doesn't have her affairs in order. Does she have a KTP, a KK, a birth certificate and possibly her graduation certificate from school? If not, it's going to be a long and tiresome journey getting all that sorted out. If her parents don't won't her to go, it'll pretty much be impossible because their cooperation will be needed to get those documents. You can double the amount of frustration she'll have if she's not from Bali. Most certificate and immigration processes have to be done in the area the Indonesian person comes from.
Also, and I'm sorry to bring it up, but you should really make sure you're not falling into a trap by some gold digger. Literally hundreds of Aussie guys have been taken for a ride and pretty much lost everything. My personal opinion is that if someone asks you for money or asks you to pay for things like clothes or jewellery, then they're no good.