Miriam Carey, 34, is said to be the woman killed by police after a high-speed chase through Washington, D.C., that led to a lockdown of Capitol Hill.
Carey, who died Thursday, suffered severe post-partum depression following the birth of her daughter last year, the suspect's mother told ABC News.
Police initially said they were withholding the name of the driver of the car involved in the chase pending positive identification and notification of next of kin.
Authorities told the media that the woman led police on a chase down Pennsylvania Avenue to the U.S. Capitol after ramming a gate at the White House.
Officials described Carey has having a "mental illness."
"She had post-partum depression after having the baby" last August, said her mother, Idella Carey. "A few months later, she got sick. She was depressed. She was hospitalized."
Carey had a 1-year-old daughter named Erica, her mother said. Police confirmed that a 1-year-old girl was taken from the car and put in "protective custody."
Idella Carey said her daughter had "no history of violence" and did not know why she was in D.C. She thought Carey was taking the little girl to a doctor's appointment in Connecticut.
Dr. Steven Oken, her boss of eight years, described Carey as "non-political" and "always happy. I would never in a million years believe that she would do something like this."
"It's the furthest thing from anything I would think she would do, especially with her child in the car. I am absolutely floored that it would be her."
Neighbor Erin Jackson said she believed Carey lived with the baby and the girl's father. Asked if she believed Carey suffered from a mental illness, she said "absolutely."
Jackson recognized the black Infiniti car on TV from the incident as resembling Carey's. She said the woman's tires recently were slashed in an incident in Connecticut.
Police, including FBI and bomb disposal units, surrounded a home in Stamford last night that authorities say is linked to the investigation, but won't give specifics.
Police there said they were awaiting a search warrant from D.C., though 50 people from the apartment building already were being evacuated for the night.
Cops said Carey eluded police after they stopped her car and drew their guns. When she continued to flee, she drove "very erratically, very dangerously."
She rammed a police car and was shot by police without exiting the car. Two officers, one from the Capitol Police and one from Secret Service, were injured.
No weapons were found in the car, police said.