There appears to be new information regarding Miriam Carey, the 34-year old woman killed in a confrontation with and subsequent chase from the White House to the Capitol yesterday.
1) She had become psychotic during her post-partum depression--a not unusual concomitant of this syndrome;
2) As a consequence, she had been let go from her work as a dental hygienist in the months preceding yesterday's incident--an indication of the deterioration and impairment of her mental state;
3) She had become delusional--delusions are a feature of psychosis, consisting of false beliefs that are often paranoid and grandiose in nature--believing that messages were being sent to her from Washington through her television.
This is such a common feature of psychosis that it is used in training those who conduct evaluations for the condition.
4) Consequently, in a paranoid and grandiose condition, she went to DC to battle the forces produced by these delusions. This would account for her refusing to stop when confronted, and continuing to drive even after the massive response by multiple DC and Capitol law enforcement personnel.
This is a tragedy It is one that could have been prevented. However, in understanding yesterday's events, it is critically important to understand her mental state, and the decisions that she was making on that basis, as well as the decisions made by others.