Maybe eating too fast. Give her smaller portions more often.
Is she drinking water ok?
That's a great idea. She was raised around 8 other puppies and it was super chaotic. Maybe she's in the habit of eating too fast.
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No issues with her stool?
Our dog had pancreatitis and that caused her to vomit after eating, have loose stools and be very lethargic. It can happen if they eat too much fatty foods. But since she is a pup and drinking and you say she seems otherwise healthy it is probably unlikely.
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Her stools look normal
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She drinks water fine.
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