If your cat only likes wet food let her have it and if shes over weight consult your Vet and buy your canned food from there. For the past 2 weeks the cat has been not eating enough and is only interested in eating liquids gravy from canned food pureed cat food. Mixing in a tablespoon or two of canned food to dry kibbles may provide a flavor boost.
Go for canned wet food thats packed with nutrients and calories for him to get going without him eating too much. You may also warm it up in the microwave to enhance the smell but mash it sufficiently so that its not too hot when she eats it. Last week the vet did x-rays and blood work and said while the liver is a little large nothing jumps out as the cause. Most commercial cat foods even wet foods have added flavors to entice cats since.