Most antibiotics are mild, really, compared to some of the NSAIDS and steroids, but some dogs
do have sensitive tummy's. Maybe giving it to her in
a shot form, bypassing the stomach?
I have a basset who has slow digestion and has episodes of vomiting after eating or drinking too fast and my vet gives me Reglan (metoclopramide) 10mg tablets...which funny enough I have for myself as I also have slow digestion and acid reflux.