While this was not a nuke plant, I would think that the security would be carrying a gun. I honestly don't remember if our guards were armed at coal plants 10 years ago when I frequented such places up north, but I certainly beleive that they ought to be now.
The other question I would have is why was she chasing them alone. She ought to have summonsed another guard and went after them as a team.
Anyway, I'm glad she's OK.