Hi Krista,
This isn't purely homeopathy, but I thought you might like to know about a book written by someone I know who raises cats naturally. In this book a raw food diet that mimicks one cats would eat in the wild is outlined: it is very supportive of cat health.
Take a look at this link:
www.blakkatz.com
it connects up to a "preview" of the book with a discussion of the research conducted by Dr. Pottenger on feline nutrition. Pottenger was a real stickler for sticking to the dietary traditions animals developed over time, particularly with people: but he also observed this principle at work with cats.
For this kitty, I would give something to address the fear of the ordeal it has survived; Nux vomica covers that, as Dr. Leela suggests...but so does the phos you mentioned. I'd lean towards the Nux v. if the kitty were extremely irritable though, and think about phos only if the irritability occurs even if the kitty wants and needs the consolation of company.