Defense Attorney Joe Spencer asked Abigail, "Did you do anything to help your brother put that baby in the car?"
After a pause and look of shock, Abigail responded, "No ... You and your client are sick."
The response lead to a brief recess, and ultimately the jury was told to disregard her statement.
The day continued with testimony from a firefighter and EMT who responded to the scene, followed by a detective with the El Paso Police Department.
According to the firefighter, Perez tried to pass her older daughter off as Jackie when he came to check on the welfare of her children.
He said Jackie was found shortly after.
According to the fire official, Francisco Carranco, Jackie had no pulse, her skin was yellowish, her eyes were glazed, she was cold to the touch, and rigor mortis had begun. She was determined "dead on scene."
Following Carranco, Detective Joe Ochoa described the apparent injuries of Jackie as the prosecution showed multiple photographs of Jackie's bruised body.
Perez went from sobbing to somber as she looked away from the photos. She never looked back at them.
The photographs displayed bruises to much of Jackie's body, with the emphasis on her abdomen. Ochoa explained the cause of death was blunt force trauma to the abdomen.
Ochoa then described the apartment as messy, and said bottles of rubbing alcohol were laying in the living room.
He added that evidence indicated a young girl may have recently taken a shower.
Defense took a hit at the prosecution's witness when they asked Ochoa whether prints were located on the bin where Jackie's body was found.
Ochoa told the jury prints were found, but only those of Francisco Castaneda.
The defense stated in opening statements Perez suffers from battered woman's syndrome and said they plan to show Perez wasn't aware where her baby was when police made contact. They said all guilt lies solely on Francisco.
The defense team said Tuesday that truth had been uncovered, but more would be brought to light Wednesday.
Wednesday the trial will enter its second day, and prosecution will continue to bring forth evidence and witnesses.