She may have felt save with cooked tomatoes since previous allergic reactions were to raw. A canned bolognaise sauce can be highly processed. She might not have realized that the allergic reaction could become that life threatening that quickly. Or that the severity of reaction could increase so dramatically over such a short time, 3 years.
A case in point: A few years ago, my sister developed a wierd allergy to raw fruits like apples and pears, after years of enjoying them raw. She can eat them canned, baked, jammed, but not raw. I will alert her after reading this story.
Good idea. I wonder if perhaps your sister may have some sort of allergy to some common insecticides or chemical treatments used on apples and pears, etc?
I know I used to be able to eat corn bread but then if I ate balogna(corn syrup whic usually doesn't bother me) within the next few days I'd have a reaction.
Now I can't space it out like that.
It's been about 20 years since I've eaten oatmeal, popcorn or bananas so if I happen to accidently eat some I might survive it the first time. When I serve such to family I do try not to touch it nor be around it.
If you have an allergy, it's just your body confusing a harmless substance for a deadly germ and the body reacts the way it does to kill the "deadly germ".
I've heard within the next 5 years they'll have a "vaccine" out that will really be a series of shots to help those with deadly food allergies such as peanuts, etc.