Perfect. I would continue to monitor her weight, and with what you've described she should start gaining soon. It may not be huge at first, as older horses are harder the get weight on. As her body starts getting what it needs from the senior feed, she should start looking better and then the weight will come.
She deserves to have you around to take care of her. At her age, she's given lots and deserves to be pampered now :) Best of luck to you and her, I'd love to see some pics of her and updates are always nice to see.
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