Is the hallway heated? If not, maybe she's thinking being outside is as good as refridgeration. I sometimes put food outside in the winter when I run out of room in my fridge...mostly around the holidays when I just want to keep something cold overnight until I can use/serve it the next day.
If the hallway is heated, then she's just nuts leaving her food out like that. I'd be tempted to relieve her of those delicious steaks before they go rotten.