Mahoning Township police said a 4-year-old girl found her mother unresponsive on the floor of their home.
The child notified her grandmother, who then called 911.
Police said illegal drugs, specifically heroin, may have been the reason for the mother's unresponsive state.
As a result, Gina Miller, 24, of Mahoning Township, has been charged with unlawful possession of a controlled substance, possession of drug paraphernalia, and endangering the welfare of children.
Police said the incident happened on June 4.