Factory sealed raw meat isn't a health hazard.
Hmmm, but who knows what it's touched before you bought it? Plenty of times I've seen say clingfilmed chicken whole or in portions that's leaking blood from its packaging. Or factory sealed containers of meat sitting on a supermarket shelf where one package has leaked or split and some are sitting in the residue.
Okay, I'm very fussy about that stuff, but in my own fridge at home, I'd never put packs of meat in it unless I'd wrapped them in a sealed poly bag myself, to stop their already contaminated packaging touching other food or just the shelves.
I wouldn't have tolerated this woman's behaviour with the communal fridge for 30 minutes, it's vile and IMO very likely to give colleagues salmonella etc.