The Prince William County mother who helped barricade her three children in a room with drywall is scheduled to be sentenced Thursday.

Christina Moore and John Robey pleaded guilty to child abuse charges stemming from March 2011, when it was discovered that the Bristow couple’s girls — then ages 4, 3 and 18 months — had been left alone in an upstairs bedroom with pieces of drywall screwed tight to the doorjamb. The eldest girl escaped and got a neighbor to help her sisters.

Robey, 35, was sentenced in January to three years of probation on child abuse charges. Moore, 26, was also supposed to be sentenced at that time, but Judge Richard Potter rescheduled since she had not yet completed a drug program.

Defense attorneys for Robey and Moore have said their clients had been in the throes of drug abuse, using legally prescribed painkillers. When the neighbor came to help the children that day, court papers said, Robey and Moore were passed out in their bedroom.

Shortly after his arrest, Robey told police that the drywall “was just like a child gate but without holes in it,” Assistant Commonwealth’s Attorney Kristina Robinson has said in court.

The girls were uninjured, although prosecutors have said the room they were discovered in was filthy and the children were hungry.

Read more: The Post’s crime coverage