Police recommend charges against William Tyrell's foster mother

But neither she or her legal team were informed about the development, according to the woman's lawyer Sharon Ramsden.

Ms Ramsden said William's foster mother and her legal team contacted detectives directly on June 28, seeking confirmation a brief of evidence had been sent to the DPP.

"[William's] foster mother had previously been ruled out of any wrongdoing in relation to his disappearance," Ms Ramsden said.

"William's foster mother and her legal representatives urge the Director of Public Prosecutions to expeditiously determine whether charges are to be laid.

"The foster mother and her legal representatives call for disclosure of the evidence which police suggest forms the basis of any criminal proceedings."

The ABC has reported a brief of evidence recently given to the DPP by detectives suggests the woman be charged in relation to concealing his death.

The strike force investigating the disappearance doesn't believe the foster mother caused William's death, the ABC said.

And it will be up to the DPP to decide if the case has any merit and should go to court.

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The theory held by police, according to the ABC, is three-year-old William died in an accident in Kendall on the NSW mid-north coast in September 2014, and his foster mother allegedly covered it up by hiding his body - which has never been found.

The woman, who cannot be named for legal reasons, has always maintained she had nothing to do with William's disappearance.

"She desperately urges the police to resume the investigation into finding out what happened to William," Ms Ramsden said.