i developed reflux for a while because i was eating fast my entire life. my grandmother joked that i would do well in the army. now i cannot eat in the evenings, or else i have to take a walk, sit up for a while, or sleep in a reclining position.

so i second the advice of smaller meals and a walk immediately after. the puppy's stomach should soon outgrow this issue. watch out for quality of poops and general energy levels, of course.

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.