She's exhausted. Skin and bones and weighs less than at least one of the birds she's dropped at my feet in the past. She doesn't know it yet, but she'll be taking a trip to the vets tomorrow morning for a thorough going over. But, to my untrained eye, she looks like a cat who has had access to water but not a lot of food for the past few weeks, and who now needs lots of small meals and lots of rest.
It's good to have her back. I'm now researching GPS cat collars, nut at the moment I think they'd weigh more than she does.