Boxermom is right. Nothing to lose at this point!
Australorps are a known broody breed so I think you'd have a good shot at her sitting on a clutch under the right conditions. Move her at dusk to a nest that is by itself in a small area (I use a extra large airline dog crate-half the space is used for the nest, the other half has shavings in it). The nest should have warm eggs that you place in it just before you add the hen. If it's darker and she has no roost, she may decide the nest of eggs is where she'll sleep. Then, by morning, she may have just decided to brood them. If she's pacing to get out, she's not ready. If she is ready, leave the "test" eggs until the others come. Make sure the new ones are warmed up a bit, you don't want to break her broodiness with cold eggs. Place them under her after dark so she will be less likely to move. Good Luck!
Australorps are a known broody breed so I think you'd have a good shot at her sitting on a clutch under the right conditions. Move her at dusk to a nest that is by itself in a small area (I use a extra large airline dog crate-half the space is used for the nest, the other half has shavings in it). The nest should have warm eggs that you place in it just before you add the hen. If it's darker and she has no roost, she may decide the nest of eggs is where she'll sleep. Then, by morning, she may have just decided to brood them. If she's pacing to get out, she's not ready. If she is ready, leave the "test" eggs until the others come. Make sure the new ones are warmed up a bit, you don't want to break her broodiness with cold eggs. Place them under her after dark so she will be less likely to move. Good Luck!