I think she means human grade canned meat which tends to have added salt etc
oh. (best emily litella impression: "never mind." lol)
scott, i've been a vegetarian for 36 years and i've been buying human tuna for my cats for the last 20.
if the cat absolutely won't eat canned food, i don't know that tuna is your only alternative. you don't want her to get so addicted to it that she refuses all other food because a cat can't live on chicken of the sea.
i don't give it to mine more than once a month, and i buy those little lunch-sized packs.
i'm not going to feed raw either. it's bad enough for me to buy the meat, but i just can't handle touching that much raw meat. i tried it, it made me queasy, pre-made like rad cat is too expensive, and i'm just not going to do it.
cooking it doesn't destroy every single nutrient--how else would people who rely on meat for their protein source survive? yes, the longer it's cooked, the more vitamins you lose and the protein becomes somewhat denatured but you can cook it lightly. minerals can't be destroyed, but if you can manage to spare the time to make your own cat food, you can buy bone meal (for humans, not for the garden), nutritional yeast, vitamin e oil and salmon oil. hearts have a lot of taurine and liver has vitamins a & d so the less you cook those, the better.
it's challenging. you might try the bonito flakes. my little fish junkie will eat the food he won't touch if i sprinkle some of that on it. it smells really strong, you don't need much. you can also try parmesan cheese (kraft, not the deli kind) some tuna juice, my cats happen to love bacon fat. (yes i bought them bacon. the people at the king soopers where i've shopped for 30 years think i've gone insane.

)