Agree on the mixed breed, would just say since your in Aussie land, she could be an Aracauna mix. Unless I got confused on the differences between breeds and countries again
She actually looks like she may be a Godborg, which is a new breed undergoing development in Australia. There isn't much about them on the internet, but I have seen a few for sale, and the local poultry breeder I use in Perth has them occasionally. Not sure where the OP is based in Australia, but you can definitely get hold of the breed in Perth.