A 22-year-old Arizona mother was arrested Tuesday for killing her three young children. She was charged with three counts of first-degree murder after she confessed to smothering her children to death. 

Police responded to a 911 call citing trouble Monday evening only to find the bodies of Rachel Henry’s 7-month-old daughter, 2-year-old son, and her 3-year-old son in their home near 24th Street and Vineyard, Sergeant Mercedes Fortune from Phoenix Police Department told CNN

"The ... mother has admitted to harming her three children," Fortune added.

Police earlier said they found no signs of trauma in the bodies and that a medical examiner was trying to determine the exact cause of the deaths. 

A judge ordered Henry to be held against a $3 million bond in her first arraignment Tuesday night. He said Henry had a history of methamphetamine drug addiction and her children were once removed from her home owing to that, according to NBC News. 

During the hearing through videoconferencing, the woman appeared indifferent about the crime, except expressing concern about the bond amount.

"I don't know how I'm going to be able to get any money," she said. "I don't have a job or anything."

Henry moved to Arizona from Oklahoma in June and had a good rapport with the community, according to the prosecuting attorney. She is due to reappear in court next Tuesday.

Police said both Henry and the children’s father, as well as a relative were present in the house when they arrived. The woman reportedly said she didn’t know who called 911. The relative told police that the three children were sick on Monday.