The suspect, Jahina Damon, 24, remains at large. Police say she may have been living in Baltimore, and Philadelphia authorities have contacted Baltimore police and asked them to be on the lookout for her.
Damon has a history of mental illnesses and has been committed in the past, according to authorities.
The killing happened while two other people, a man and a woman, were also in the home along the 6000 block of Cobbs Creek Parkway just after 5 a.m.
Police say Damon came to the the home early Thursday morning in order to apologize for something. Damon was in the home for about 30 minutes, then shot her 52-year-old mother, Lolita Lee, in the chest. Lee grew up next in the house next door to the home where her daughter shot and killed her today.
Investigators say Damon fired shots at all 3 of the people who were in the house, but Lee is the only one who was hit. Then, Damon set fire to her mother's body.
A woman who was in the home at the time drove herself to Delaware County Memorial Hospital with serious burns. She was listed in critical condition.
The man in the house was apparently not injured.
