Was she trying to get to Obama?
She had driven from Stamford, CT, to DC without telling anyone. I think her family said they believed she was taking her daughter to a doctor's appointment.
Her initial encounter with police was when she reportedly drove over several low barricades and into a driveway leading to the White House. There, she was stopped by a larger barricade.
Her family members reported that she thought Obama was monitoring her, so he could broadcast her life on TV. To me, it seems like she mixed up an obsession with Obama, plus the revelations about NSA spying, and came up with a bizarre scenario.