The mother of a 9-year-old boy who was abandoned near Boise last week waived her rights to an extradition hearing Thursday before 3rd Circuit Judge Michael Hutchings, who ordered Idaho authorities to pick her up by Jan. 23.

Deborah Tuinman, 28, will be held in Salt Lake County Jail until that time. Her husband, Edward, 29, said he will fight extradition.Meanwhile, the investigation of the Sandy couple has extended to three states.

Yakima County, Wash., Sheriff's Lt. Jerry Hafsos said he assigned a detective Wednesday to look into whether the Tuinmans abused their child, Eddie, 9, while they were living in Buena, Wash., a small town outside of Yakima.

The Tuinmans are being held on a fugitive warrant out of Boise charging them with felony desertion of child.

They were arrested Jan. 7 near Nephi after authorities launched a search for the couple, who are charged with abandoning Eddie at a rest stop on I-84 outside of Boise on Jan. 4. The Tuinmans were en route to Arizona looking for work.

The boy was found to have been severely abused, suffering burns, bruises and malnutrition.

Sandy detectives are investigating the Tuinmans because the family lived in that city before they moved to Washington in search of work.

Eddie was found to have injuries that could have been suffered months ago, which led Sandy and Washington police to begin their own investigations.