Chicago police say 26-year-old Charlis Harris threw the acid on the woman in the 7800- block of South Constance on Wednesday. It burned the victim's face and torso and left her disfigured.
Some of the acid also hit the suspect's young daughter, who has minor injuries.
As the victim ran away, police say harries fired a gun at her. She missed.
The women were apparently involved in an on-going feud.