Apologies, just speculation! Should know better than to write my stream of consciousness!
I can’t imagine walking out without a phone either, although I’ve done a quick walk through night check without mine before. Check everyone’s snug in their stall, treats, pets and lights off.
Some barns would have people there early and starting at 6-6:30AM, others don’t start up until closer to 8AM. Mine doesn’t start turnout until close to 9am some mornings. Might also depend if they have grooms, barn help, etc. or if she was responsible for those things. I wonder how many horses are on the property.