how are her teeth and gums?
what is the name of the cat foods you have tried?
is she over or underweight?
Please stand by while I type detailed answer.
Most cats enjoy a varied diet. They get very bored eating same thing every day just like we would and they seem to know just what their nutritional needs are.
PLEASE do not feed your cat any more lunchmeat. I know that you just want her to eat but the salt and additives in these products are very harmful. A/D is an excellent food, I give it to my own cat - he loves it but he will not eat is every day. The answer to this problem is to stock up on several different flavors of cannned food and vary her diet at every feeding with a different one so she does not get bored by one.Make sure she is hydrated with plain pedilayte because if she is dehydrated she will not eat. You can also try adding a little water to the canned foood because if she has any dental pain it will result in lack of motivation.I would certainly try this before I spent any more time and money testing.
Please let me know how it is working out and if you have more questions. I will be happy to help in any way possible.