Capitol Shooting: Miriam Carey's Motive for Car Chase Still Mystery

The reason why Miriam Carey, the woman at the center of the Capitol shooting Thursday, rammed her car against a White House barrier before initiating a high speed chase that ended with her being shot dead by law enforcement is still a mystery.

A 34-year-old dental hygienist from Stamford, Conn., Carey was suffering from post-partum depression following the recent birth of her daughter, according to her mother.

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Carey's one-year-old daughter Erica, who was in the car with her mother during her fatal driving rampage, is said to be in good condition after being recovered safely from the vehicle. She is presently in "protective custody," police told ABC News.

"She had post-partum depression after having the baby" last August, Idella Carey told ABC News. "A few months later, she got sick. She was depressed. ... She was hospitalized."

According to the woman's mother, her daughter had "no history of violence."

Sources close to Carey told NBC News that she had a history of mental health problems.

Additionally, law enforcement sources investigating Carey told NBC News that they found indications that the woman thought that President Barack Obama was stalking her.

Further details were not reported.

The terrifying incident came just two weeks after a deranged gunman killed 12 individuals in the DC Navy Yard.

Much like in the case that preceded it, authorities do not believe to terrorism played a role in Thursday's Capital shooting.

The incident began shortly after 2 p.m. EDT, when Carey drove over a set of barricades and proceeded onto a driveway leading to the White House. Being unable to breach the second barricade, Carey spun the vehicle around and in the process flipped a Secret Service officer over the hood of the car in her attempt to evade authorities, the Associated Press reported.

"This wasn't no accident. She was not a lost tourist," B.J. Campbell, a tourist from Portland, Ore. who witnessed the incident, told the AP.

A brief chase quickly ensued.

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"The car was trying to get away. But it was going over the median and over the curb," another witness Matthew Coursen told the AP. "The car got boxed in and that's when I saw an officer of some kind draw his weapon and fire shots into the car."

Two individuals were injured as a result of the incident, one Secret Service agent and the other a 23-year veteran of the Capitol Police Department. Both are expected to recover, according to the AP.