This was her problem. She obviously thought it was fine to let her chickens free range day and night.But an insecure coop can trap them so they can't escape.
I don’t. Because I’m convinced my coop its safer at night.
BTW, in England (+ a couple of West European countries) there are no raccoons, bobcats and many other predators you have in the states. The nightly predators I know of are: foxes, and members of the weasels/polecat/marten family:
https://www.vwt.org.uk/wp-content/uploads/2015/04/MustelidLeaflet.pdf
Not sure about owls or other nightly birds of prey. The smaller owls we have hunt mainly for mice and rats.