The incident happened in a lot on Pearl, between West Tupper and Chippewa streets, according to police reports.
The suspect pushed the woman from behind, causing her to strike her head on a truck.
The victim also was stabbed in the right thigh and had abrasions on her side and stomach.
The attacker tried to remove the victim’s shorts, when she slapped the suspect between the eyes with the stun gun, police said.
The police report did not say what time the attack occurred.