Good question, the poor woman was unarmed.
There is something very very strange about this situation/matter. The woman was obviously deranged. She yelled out that in her head she had to speak with Obama. Someone gave the cops an order to dispose of the woman instead of merely taking her into custody. Apparently she got blocked in and had no other lethal weapons once the car was blocked. She was killed with a fusillade of shots. There has been no public presence to explain why such fatal action was necessary or taken. There has been little if any public disclosure of the lady and her background beyond her occupation. The entire incident has been taken off the public radar. It seems to me that at the least there is something more to looking at why this lady would have had such a mental fixation on seeing Obama. Are all Presidents going to be in danger of such deranged persons. Reagan was but his shooter was captured alive.