You think its a good idea to maybe put the dog in her crate while the cat gets use to the upsetairs then slowly introduce the concept of cat and dog again?
Don't worry much about the incident, I think both your animals are stressed by the issue.
Feed them both out of your hand one at a time more often. Place your cat used toilet bits around the house, spend at least one night with both of them in your bedroom. They should be "introduced" to each other again. I'd call your new vet and ask if any sedatives or tranquilizers could be used in such cases. I use valerian for my dog if she's stressed. Dogs not so, but cats could be terribly stressed being moved away from their usual home.