I hope things are getting better for your kitten. Craftlady is right, the emergency vets won't make assessments over the phone, not only for liability reasons, but because the way we describe symptoms etc. is variable and not accurate clinically.

Keeping her hydrated is of high priority and that's why it's good that you are feeding her wet food. I use Metamucil in wet food (and sprinkled over dry for a cat that isn't dehydrated) to help solidify fecal matter. If she won't eat the pumpkin pie filling either on its own or mixed in her food, get the non-flavored Metamucil and don't use much because, even though a cat won't taste it, it is a little grainy and some don't like the texture. You might want to stick with low-fat yogurt until her stomach is more settled.

Clear vomitting can be caused by stress and hunger also. Your kitten must have been very stressed from the shelter, surgery, vet visits, new home and then being medicated. Very often there is more than one reason for a symptom and that can be confusing for all of us, including the vet. Cats are notorious for hiding their illness so by the time they show you they are ill, they are really ill.

Good luck to both of you!