Lucy was a beautiful cat and I am so sorry for your loss.
I am also at the point of looking for a new vet for my cats but if I were in your situation I'd be really angry and would 1) not even think about changing vets, i'd do it immediately before I ran into a problem with my other kitties. and 2) I'd lay a complaint with the veterinary college of BC because she obviously ignored things that might/probably would have saved Lucy's life.
all the best to you NIKKIB