Twenty-three-year-old Jhenea Pratt had called 911 in April to say her toddler was unresponsive.
Pittsburgh Police say fentanyl, a powerful opioid, was found in the child's sippy cup and her body.
Pratt has been charged with criminal homicide and endangering the welfare of a child.
------
Send a News Tip to Action News
Learn More About 6abc Apps