@DidIDoTheWrongThing as you know obviously vegans would know that mozzarella is not vegan. If described as 'mozzarella' and they had been told it was a vegan menu they might presume that it was though. Vegan 'mozzarella' is even sold in Tesco. Zizzis use one called mozzarisella I think made with rice milk. I don't think there is any implication that someone said they were vegan then ate mozzarella without checking it was vegan - from what I've read one member of the group clearly only vegetarian or omni ordered off the regular menu.
Metro reported: '‘Pious, judgmental vegan (who I spent all day cooking for) has gone to bed, still believing she’s a vegan,’ Goodman wrote in the early hours of Saturday morning. When commenters asked her if this meant she had put non-vegan food in the group’s meal, she responded: ‘Actually I should have said “they’re” not a vegan… not “she’s”. Started with asking me to telephone them, over Christmas, to discuss the dietary requirements of their guests within a set time frame, and ended with me wondering why I’m explaining this simplistic post to a pious c**t.’ Elsewhere in the group, on the same night, she wrote: ‘Spiked a vegan a few hours ago.’
Clearly no vegan would leave thinking they'd eaten vegan food unless they'd been told that it was vegan. So she was pissed off that one person was not vegan and had ordered off her regular menu, but had deliberately 'spiked' the vegan food with dairy/egg/other anyway! That's how it reads as far as I can see - from her own mouth.
@ ThumbWitchesAbroad according to the second comment one member of the group just ordered a normal pizza off the regular menu though, not that the whole group did or indeed that any of them requested something outside of that diet. Unless they had specifically said e.g. we'll be a party of 8 vegans and she'd prepared 8 special meals and only 7 of them were taken by the group; that might be frustrating for her but is hardly a huge deal. Even then, everyone else can eat vegan food too!
Of course she doesn't deserve death threats but she does deserve to lose her job. Exposure to dairy for some allergic people can cause a seizure which would mean they'd lose their driving licence and potentially their job. And of course the physical effects could be worse than that. Vile woman.