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A 27-year-old woman has admitted holding down a 2-year-old and 4-year-old girl while her husband raped them.

Defense lawyer Patti Campbell says Sierra Clark has a low IQ and was "groomed" by her husband, Ronald Clark, to help him carry out the rapes of the girls. He's now serving at least 27 years in prison for rape and child pornography.

The Post-Standard reports that Sierra Clark pleaded guilty Thursday morning to helping her husband rape the two girls multiple times between April and August 2010.

Because of her low mental capacity and her cooperation with the prosecution, Judge Anthony Aloi agreed to sentence Sierra Clark to 15 years in prison.

She has terminated her parental rights and is seeking a divorce.

Source: The Associated Press