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PHOENIX — An Arizona woman who put her 17-month-old daughter in a stroller, pushed her into the desert and left her to die on the nation’s largest American Indian reservation has been sentenced to 20 years in prison.

U.S. District Judge David Campbell said Ashley Denise Attson, 23, committed an “intentional, cold-hearted, horrendous killing of an innocent child,” imposing Monday the high end of a sentencing range detailed in a plea agreement with prosecutors.

Attson had pleaded guilty to second-degree murder in the September 2016 killing on the Navajo Nation. Her defense attorney, Ashley Adams, did not immediately return a call for comment.

Attson left her daughter in the desert for four days and nights before retrieving the body and burying it in an animal hole, the U.S. Attorney’s Office for Arizona said Tuesday in a statement.

“Over the next few days, she met friends for ice cream and posted pictures of herself on Facebook,” the statement said.