[anonymous]

Have you tried a prescription/therapeutic diet? Surely your vet has suggested it. Otherwise, keep the diet bland, at least till she is stable.

See what your vet advises. Do you have dog health insurance? Find a vet that you trust (if you don’t have one already,) and discuss.
Corgis are very loyal, she may be still grieving her former family. Her condition may be stress related.
Good luck