Rachel Henry is accused of smothering the three children to death at a relative's home in south Phoenix in January.
The 22-year-old mother was charged with first-degree murder for the deaths of her children Zane, Miraya and Catalaya, who ranged in age from 1 to 7 years old.
Police say Henry confessed to the murders but gave no explanation about what drove her to killing her children that night, but new 911 recordings detail some of the chaos that night.
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