Here is a link for your mom that you can print that has walmart's brand and sophisticat which I think is petsmart brand...
it's an older list so the values might not be as accurate anymore ( pet food companies often change things up and they look for cheaper
ways to mass produce) but if she sticks with pates or looks at the ingredient lists she can avoid the suspect ones ( no gravies)
janet/binky's canned list
As Dr. Lisa Pierson says, any canned food is preferable to dry.
Do be warned that with the cheaper foods, it is best to minimize any seafood varieties....
Pet food uses the leftovers sitting there that isn't good enough to go in human foods.
She can also watch for sales and buy in bulk...
WholeFoods grocery sells Wellness and they put sales occasionally... as do the other stores like PetsMart who had friskies cans for 50cents
when I was there yesterday and I bought a case of fancy feast for 55cents a can...
Walmart also sells small cases of fancy feast classic chicken and turkey and giblets and it's cheaper that way than buying one can a a time...