The victim, Delanna Joann Womack, of South Potomac Street, was stabbed in the hands, the middle of her back and in her upper chest at about 10:05 p.m. Thursday, according to Capt. Robert Hart of Hagerstown City Police.
According to court records, Womack's left lung had partially collapsed.
Womack was in fair condition at Washington County Hospital on Friday night, a hospital spokeswoman said.
In a statement to police filed with charging documents, Womack said she went to Laurel Street with two other girls to confront Seal and tell her to stay away from her ex-boyfriend, John Womack.
John Womack was dating Seal, according to court records.
After arguing, Seal went back inside her apartment and when she came back out, she allegedly jumped through the passenger side window and struck Delanna Womack in the back and chest, according to court records. Her hands were cut when she raised them in defense, court documents said.
According to charging documents, Seal yelled to Womack, "I'm going to kill you. I want you dead."
One of the girls was able to pull Seal away from the car, but Seal opened the passenger side door, jumped in and started striking Womack with the knife, according to court documents.
Then Seal allegedly threatened one of the other girls with the 6-inch steak knife but the girls got it away from her, police said.
Seal fled the area but was apprehended a short time later in the 800 block of Potomac Avenue by Capt. Robert Voytko, Hart said.
According to court documents, Seal said "she threatened to kill me and I had to defend myself" as she was placed into the rear of the car.