A judge-only retrial has been ordered for a Gold Coast mother who was last year convicted of dressing up her primary school-aged daughter in a Playboy-style outfit and joining in on her gang rape.

The girl allegedly endured horrific abuse at the hands of her mother, who cannot be named for legal reasons, and her mother's friends, while her father was in prison.

The Gold Coast mother denies raping her daughter. Credit:File Image

One night the girl walked in on her mother having a threesome with two men in the garage of their home, the prosecution alleged at the mother's first trial.

The girl told her mother she “shouldn’t be doing that” and the mother told her to go back to her room, which she did.