MIAMI -

Trial has resumed in the case of a South Florida woman accused of killing missing Florida foster child Rilya Wilson with the key prosecution witness still on the stand.

Jailhouse informant Robin Lunceford was undergoing cross-examination Wednesday by an attorney for defendant Geralyn Graham. The defense is trying to poke holes in Lunceford's story that Graham confessed in jail to smothering 4-year-old Rilya with a pillow and burying her body near water. The body was never found.

"You just don't recall certain things when it's not convenient, is that right?" said defense attorney Michael Matters.

"If it's frivolous and has no meaning to child murder, I just don't try to remember it," answered Lunceford.

Lunceford had her life sentence cut to 10 years in return for her testimony.

The 66-year-old Graham faces life in prison if convicted of murder, kidnapping and child abuse charges. Graham claims Rilya was taken from her home for mental tests by a state worker in 2001 and never returned. Investigators say no evidence backs up Graham's story.

The trial is expected to last several more weeks.