Forty-five-year-old Carla Blood, of Birnamwood, faces a felony charge of child abuse.
An investigative report says Blood told the grandfather of the 11-month-old girl when he came to pick her up that the child was "out of control" and that she spanked her because she "needed discipline."
Daily Herald Media says the grandfather took the girl to the emergency room at Langlade Hospital. Police say a doctor told investigators the injuries appeared to have been caused by a "foreign object" striking the girl.
Blood is due in court March 20. Court records do not list a defense attorney.