The trouble with dry cat food is that it doesn't make them feel full. So they overeat. And they still feel hungry. I give my cats a little dry food, since they've eaten it all their lives, but in the evening they get a raw meat mix that i make for them. My fat cat is no longer fat, my other cats look great too. It took about a year. SInce i changed their diet, they all look a lot better. They have glossy coats !

Bottom line, your cat does not need 1 cup of food a day. She's getting dangerously fat.