Well, we skipped the feline leukemia shot this time. He wants her to come back in about 3-4 weeks for another Prednisone shot, so we'll get it then...
If this kitty is indoors all the time, and you don't have other cats that test positive for it, I might skip that one anyway if the vet doesn't guilt you badly over it.
It is spread through saliva, so they get it from fighting or sharing food and water dishes with other cats.
You would only have to be careful that you didn't bring it into the house with a new unvaccinated kitty.
I lost a cat to FLV... so I vaccinate mine, but they go outside. They can only get this one from other cats.