One simple reason why she was there: it is her JOB to accept risk in order to get the story. She gets paid EXTREMELY well to be there in dangerous environments in front of a camera. More than a high-rise construction worker, more than a coal miner, more than an inner-city cop, more than a soldier.
If she wasn't willing to go where the story is, regardless of risk, then she would be out of a job.
And she probably had a false sense of security from being surrounded by a dozen or so camera people, gophers and security men.
But in the mass mob, her dozen protectors were swept away like dust, leaving her alone.