The incident happened a little before 10 a.m. on July 7 on State Route 136 in Hempfield Township.State police said they responded to check on the welfare of the child and found Carmen Riffer, 20, asleep in a nearby residence.
Police said Riffer told them her 2-year-old daughter must not have woken her up.
Police said the young child found on the side of the road was dirty and had a full diaper.
Investigators also said the residence was covered in food waste and smelled of animal feces and decomposing garbage.
Riffer is charged with endangering the welfare of children and faces a preliminary hearing on Oct. 15.
Incident happened in July