A Perth woman wiped away tears on Friday as she pleaded guilty to being part of a child sex ring that involved the abuse of her young daughter by herself and two other men.

Key points: Three people, a woman and two men, were charged over child sex abuse incidents linked to "swinging" sex parties

Three people, a woman and two men, were charged over child sex abuse incidents linked to "swinging" sex parties They have all pleaded guilty to an initial string of charges connected to the abuse of the woman's 8-year-old daughter

They have all pleaded guilty to an initial string of charges connected to the abuse of the woman's 8-year-old daughter They are yet to plead to hundreds of additional charges laid by police a month after the initial charges

The 39-year-old mother, who cannot be named to protect the identity of the victim, admitted a total of 17 charges including sexual penetration of a child under 13, indecent dealing with a child and indecently recording a child.

She was charged after a member of the public discovered a recording device which contained videos of the woman and the two men abusing the then 8-year-old girl.

Police then set up a special taskforce, codenamed "Mirzam" to investigate allegations that the child had been abused during organised "swinging" sex parties.

WA Police Taskforce officers searched six properties in Perth and regional WA as part of an investigation into the child sex abuse ring. ( Supplied: WA Police )

The men, one of whom was the child's 45-year-old stepfather, pleaded guilty to a string of charges earlier this year.

The woman pleaded guilty when she appeared in the Perth Magistrates Court on Friday via video link from Bandyup Prison.

She spoke only to enter the guilty pleas and to say that she understood the charges against her.

Taskforce Mirzam officers executed search warrants at six properties in Perth and regional WA as part of their investigation. ( Supplied: WA Police )

Hundreds of charges remain

The trio are also facing hundreds of other child sex charges that were laid by police about a month after the initial charges, but they have not yet been required to plead to those counts.

On Friday the woman's lawyer, Simon Freitag, said it had been decided with WA's Director of Public Prosecutions that the three should be sentenced as soon as possible for offences they have admitted, and once that was finalised the other charges would be reviewed.

The woman was remanded in custody until she appears in the District Court next month, when a sentencing date may be set.