Welcome to the forum zuzupetals, would love to see pics
First off what are you feeding? brand/variety?
You mention a sensitive tummy - has she always been on the same food or have you tried others?
Has she gotten into garbage/eaten something on a walk etc?
What was the meds the vet gave her? Was it a dewormer?
Avoid biting when a simple growl will do
The Spirit Lives As Long As Someone Who Lives Remembers You - Navaho Saying
Vindication ~ For all those pets who became sick or lost their lives from tainted pet food