So her right to eat nuts supersedes your right to live! Okay 🙄
Go to the GP or specialist and get a letter stating you have a nut allergy and it’s not just eating nuts, but being around nuts, and also get the letter to actually specify what an anaphylactic reaction looks like.
Educate every. Single. Person. Including the owners, and managers, on how to use the epipen, as allergies worsen on exposure, so eventually you will need the epipen and you might not be in a fit state to administer it yourself.
Get an allergy bracelet or necklace if you don’t already have one. Have a health management plan that is shared with the owners and managers in case of worst case scenario.
It might be worth joining a union, or getting an employment lawyer to contact your employers and spell out what kind of legal difficulties they can expect this lovely woman to visit on them with her refusal and blatant disregard for work health and safety rules.
Lastly, if you implement all this, do your work, are reliable, competent and consistent, the owners will have a hard time proving to a tribunal that your employment ended for reasons other than your nut allergy. But you should keep a record every day, of symptoms, duration, time of day, etc. Also, try to remember that it’s a workplace. Popularity gets no one anywhere if they kill their work colleague because they refuse to stop eating something that the colleague is severely allergic to! But document, document, document. Every time the supervisor asks her to desist and she refuses, what her refusal is and how the supervisor then deals with this refusal. It may be that you have to be firm and take the legal route.
Being a vegetarian/vegan/fruitarian/keto or any other meal plan of choice, is not a protected class and there’s no law, in any country that I know of, where there is legislation protecting someone’s right to eat nuts! In short, this woman is nuts!