Carolyn, if it was only a small amount of vomit it may not be an indication of the same condition she was treated for. If she retained most of the formula, try feeding her at the next regular interval. Maybe try feeding her a bit less, though. See what happens then.
I was going to say that if the symptoms progressively turn out to be identical (which they hopefully will not), you may want to call the vet clinic and attempt to speak with your vet over the phone. I've done this a number of times with my vet for various things and he has always called me back to discuss my concerns.
Your vet obviously knows that Georgia has recently been treated at the clinic and that her current symptoms, if stemming from the same cause, are most likely related to the condition she was treated for (crop burn with ensuing infection, correct?). So I would think/hope your vet would be willing to consult with you by phone. Can you try doing that if it becomes necessary?