Mangum is charged with felony first-degree arson stemming from a domestic dispute with her boyfriend earlier this year.
Police say that in February, she punched and scratched her then-boyfriend Milton Walker, threw his clothes in a bath tub, and set them on fire. Mangum's three children were in the home at the time, and one of them called 911.
Mangum is also charged with three counts of contributing to the delinquency of a minor, injury to personal property and resisting a public officer.
In the video shown to jurors Tuesday, Mangum tells a police officer that her boyfriend repeatedly hit her in the face in front of her children who began to scream and cry.
"He was punching me, kids jumped on his back, little ones were crying," she said.
During the emotional interview in which Mangum cries, she denies setting her boyfriend's clothes on fire and using a vacuum cleaner to damage his car windows.
She told police her boyfriend suffers from schizophrenia and damaged his own car and possibly set his own clothes on fire inside a bathtub at the couple's apartment.
Also, she claims when police arrived, they threw her on the ground and accused her of resisting arrest before asking her any questions.
"They just threw me down. They didn't ask me any questions. They just threw me down," she said.
Police officers have already testified in the trial that Mangum was uncooperative and threatened her boyfriend in their presence.
Mangum - a former stripper - made national headlines in 2006 when she accused several Duke Lacrosse players of rape. The players were later exonerated and all charges against them dropped.