OH thank goodness Mia is doing better

I'm so glad for you!
The vet is right about taking it easy on her tummy with food. You'll be able to feed her more as the days go by, but after her digestive system getting such a shock, it needs time to get going properly again. They all seem to love the plain chicken baby food, or some plain white rice with minced boiled chicken in it. Ask your vet, though, before you give her anything different.
Continued prayers for Mia's full recovery