It does take some cats time to adjust to having a new type of food source. You may have been giving her a bit too much to start if those are 5.5 oz cans.
The first thing I recommend is to stop looking for 'good' food in the grocery store....you're very unlikely to find it there. Foods like Meow Mix Market Selects may have 'real' ingredients at the start, but then degrade to things like wheat gluten, artificial colors and flavors, modified food starch (since it doesn't define the source it can be anything including corn) etc.
Good foods include brands like Wellness, Natural Balance, EVO, Innova, Holistic Select, Fromm, Merrick, Nature's Variety, Tiki, Weruva and a bunch of others...that list gives you a good start. Go to their websites and use their store locator to find a store near you. Some of these can be found in Petco and Petsmart too.
Start off by giving her a teaspoon per meal and work it up as long as her stool is good. You can also add some canned pumpkin (no pie spices) to help firm up her poop.
Regarding fish...I have a Maine Coon who can't eat fish. The higher on the ingredients list, the more watery things are.
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