The condition of a woman who lost an arm in a "horrific" lion attack at a zoo has stabilised but she is yet to explain how the mauling occurred.

The woman who lost her arm in a lion attack at a Queensland zoo is the sister of the owner, Stephanie Robinson.

MELBOURNE, Australia (AP) — A woman has sustained severe injuries to an arm when she was attacked by a lion at an Australian zoo. The Darling Downs Zoo in Queensland state said the 50-year-old woman was watching animal keepers working in the zoo’s carnivore precinct before opening hours Sunday morning when she was attacked.