NEW YORK -- The mother of a Connecticut woman who was shot to death by police after trying to breach a barrier at the White House said her daughter was suffering from post-partum depression.

Authorities said the woman set off a high-speed car chase that put the Capitol on lockdown Thursday and caused a fresh panic in a city where a gunman killed 12 people two weeks ago.

Two law enforcement officials identified the driver as 34-year-old Miriam Carey, of Stamford, Conn. She was traveling with a 1-year-old girl who avoided serious injury and was taken into protective custody. The officials spoke on condition of anonymity because they were not authorized to discuss an ongoing investigation.

Carey’s mother, Idella Carey, told ABC News Thursday night that her daughter began suffering from post-partum depression after giving birth to her daughter, Erica, last August.

“A few months later, she got sick,” she said. “She was depressed. ... She was hospitalized.”

According to court records in Connecticut, Carey had been sued by her condominium association for failure to pay fees.

The complaint filed in November by the association for the Stamford building Carey lived in said she had failed to pay her fees in full since August 2010 and owed the association $1,759 in addition to collection costs. The lawsuit was settled in February.

The lawsuit by the Woodside Green Association indicates Carey took out a mortgage on her Stamford condo in the amount of $237,616 in September 2009.

Idella Carey said her daughter had “no history of violence” and she didn’t know why she was in Washington on Thursday. She said she thought Carey was taking Erica to a doctor’s appointment in Connecticut.

ABC News reported that Miriam Carey was a dental hygienist. Her boss, Dr. Steven Oken, described Carey as a person who was “always happy.”

“I would never in a million years believe that she would do something like this,” he said. “It’s the furthest thing from anything I would think she would do, especially with her child in the car. I am floored that it would be her.”

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Associated Press writers Eric Tucker and Adam Goldman in Washington contributed to this report.