Maybe she's still hungry.
You could try adding green beans, or shredded carrots to her food.
Even canned pure pumpkin is fine.
These foods aren't designed to put weight on a dog. Only help with weight control, in dogs that love to eat.
With that said, mine always increased their appetite during growth spurts, and in colder weather. They needed the extra calories at the time. You just need to adjust the food for that time period.
Not all those who wander are lost.
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