Keisha Jones, 25, of the 10900 block of South Eberhart Avenue, has been charged with first-degree murder following the death of Iyonna Davis, who died Saturday night.
An autopsy found the child died from blunt head trauma and child abuse. Jones will appear in court Tuesday.
Davis' death was also under investigation by the Illinois Department of Children and Family Services, which was looking into an allegation of neglect, agency spokesman Jimmie Whitelow said. DCFS has had no prior contact with the family, he said.
On Saturday, paramedics took Davis to Roseland Community Hospital, where she was pronounced dead at 9:28 p.m., the medical examiners' office said.
The Sun-Times Media Wire contributed to this report.