Yes, your mil successfully raise 6 children. But how long ago was that? I majored in Home Economic, graduating in 1966. We were not concerned about meat born salmonella. It didn't exist back then. We had very few if any anti-biotic resistent bacterias. In comparison to today our world was much more germ free.
I think we started hearing about keeping our uncooked meats and their juices away from other foods perhaps 20 years ago. At first I didn't believe it was necessary. But I did more investigation and read stories in newspapers and magazines and was convinced to keep raw meats and other foods separate. Does she remember the salad bars that were contaminated, causing many people to be ill and some to die?
Perhaps you could give her a book about home sanitation. Many of the newly published cook books include that information. I think the booklet one studies to take the food handlers exam might have enough info in it for her. Do you help her cook? Could you arrange to be the one who handles the meat or the other food. That could keep them seperate
Here's another concern that I read about recently. That when we flush the toilet germs are scattered outside the toilet. We don't see them but scienctists have done tests and say the bathroom floor has more germs than the kitchen floor. I think that was the comparison. Also women's handbags are germ attracters because we aren't careful where we set them down. MOst of us put them on the floor. Then we come home and set them on the table or the counter. Many more germs than what we pick up on our hands.
Ssuggested remedies. Close the toilet lid before flushing. Guess that takes care of the seat up or the seat down fight.:):):) And, either don't set your bag on the floor or wipe it off with sanitary wipes.
As for small objects in the mouth; perhaps you could take some safe toys to your mil's house and leave them there for use during your visits.
I thinkk it's reasonable for you to be concerned and also reasonable that you find a way to educate her. I'd approach it in a light hearted manner. If she has a good sense of humor use humor. Start out not too serious but firmly enough that she knows it's important. Give her a lot of praise for raising those 6 children. Suggest that we just can't do somethings the same way that she did because the world has changed.
If after a concerted effort at education she still mixes up raw meat with vegetables tell her you'll come visit but you can't eat there. Emphasis how much you'll miss that.
I just remembered that I learned about meat and illness from a friend while she was helping me cook or I her. She said something like have you heard ..........talking about a specific information that she'd read about. Then we pulled out another cutting board.
If she doesn't wash her cutting boards in the dishwasher she needs to wash them with a bleach solution and let the solution sit on the board for a few minutes before rinsing it off. Or have consistent designated boards for each use. I like the idea of a package of different colored mats. They easily wash in the dishwasher. Perhaps at some point you could bring her a package of them. This may be a product that's new to her.
I like to try out new products. And I like pretty things for the kitchen. Since she doesn't seem to want change new mats may not work for her.
I remember one of my somewhat goofy cousins wrapping his arms around his mother, giving her a squeeze and saying something like, "Ma you're not going to do that are you? You want me to die?" all said in good humor. It worked.
I always made real egg nog with raw eggs for years and years. Then all of a sudden I hear that our eggs now carry salmonella and must either be cooked or pasteurized.
Another approach could be for the small objects that Daughter doesn't manage those well. I'm afraid she'll swallow them. Maybe your kids did better. Finding ways to say things so that she is less likely to feel defensive could help. I know you cook differently than we do and it worked for you. Could you follow some simple steps when you cook for us because doing that will make us feel much more comfortable eating here. We love to be here. We like your food. We just want to keep the raw meat separate from the other foods.
As an adult I am not so worried about some of the sanitation issues. I've had food poisoning more than once. Twice I was very ill during the first week of my vacations while I was staying at a motel. I didn't like being sick but it wasn't fatal or even long lasting. However, I remember that it is babies and young children who get the sickest from food poisoning. And I should start making myself aware that I've now joined the older generation that is also more susceptible. :):)
Good luck. I think that a large group, perhaps a majority of older adults do not keep up with changes and even when they do hear something they resist the change. We have a light hearted saying in our family that helps those of us wanting to make a change feel better so that we can continue working on it. "well what do you expect? The first answer is always no." Changing something often takes time and patience.