A lot of them will need 1/3 less calories post-spay. It sounds like you are needing to reduce it much more than that, so the first thing I would do is go ahead and talk to your vet about running some blood work to make sur eeverything metabolically is normal. My first thought is a thyroid issue.
If all is normal, then you may be able to go down to 1/4 cup, but that's really not much food at all. Her exercise needs to be increased.
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