It may not have been a hit but I do know she was shot in the head and in the heart. Both locations would support a theory of a professional hit...she wasn't surviving both of those wounds. She was basically on life support until they got her to the hospital when the doctors said they couldn't do anything for her. I know one of the first responders...he said she was basically gone when they got there.
Or that the shooter had a basic understanding of human anatomy