As a kid, she pushed me to drink milk and eat ice cream. I hated the things. They made me ill but I didn't realize that they were what were making me ill. At age 16, a Dr. told me to stop drinking milk. I did. I got some better. But... I didn't know enough back then to realize that it also meant not to consume foods that contained milk. Neither did my mom and she still doesn't today.
She is not supposed to have eggs. She will make a big announcement at dinner and say that she is not going to have eggs! And then she will order a waffle or pancakes. When I point out to here that there are eggs in there, she tries to tell me that there aren't. She did the same thing with me about some soup. I have made the soup from scratch and I know that it contains eggs. It is the Greek Avgolemono. I'll bet that Avglo or something similar even means egg in Greek. I just gave up on that one. She kept insisting that it was cream in the soup and not egg.
She doesn't think that some things matter. Like a little flour used to dredge a pork chop in.
All the time I get how it is just a little bit and that a little bit can't hurt. Cross contamination can't hurt! What I tried to do with her...but it didn't work was to use the medication thingie. She takes some prescription medications. I asked her to show me her smallest pill. It was indeed very tiny. So I said... "Why don't you give one to Angela?" My daughter. She looked at me like I was nuts. So I said... "Well it's tiny! A little bit won't hurt her. Right?" She didn't get it. To me it is very much the same thing.
Sadly some people will just never get it. And then we have to deal with it. My mom has even asked us not to mention our foods in front of her. Because she doesn't want to hear about it. *sigh*