If your cat loves treats, but you see her weight increasing, consider vegetables as treats. It may take some experimentation to find out what she’ll eat, but many cats like veggies. Two ounces is about 20 calories. Cut them up to the size of kibble and put it in a bowl. Hint: Some cats really like zucchini.
It’s wise to cook the vegetables to liberate the nutritional density. Raw vegetables don’t have any advantage except that they aren’t as calorie dense. Canned or frozen is a great option because of the convenience.
Stick with vegetables, however, and maybe a bit of apple. Remember, though, that cats aren’t into sweets, so most fruits will not be enticing.