Could my mom get in legal trouble for not making her cat lose weight?

My mom has a 2 year old cat. She took her for a yearly check up a couple of weeks ago. The vet wanted her cat to lose a pound. She was 8 pounds. She's feeding her less, but i weighd her, a couple of days ago, and she's like 13 pounds. I'm afraid that the next time my mom takes her cat for a check up, which is next month, that the vet will see She gained a bunch of weight, and then they will report my mom, and the cops will get involved.

Could my mom get in legal trouble for not making her cat lose weight?
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