Our new semi-feral kitten (about 7 months old) was spayed and vaccinated yesterday (rabies, 4 in 1). She's still lethargic, isn't that interested in eating, just sleeps and sleeps, preferably in my lap. The vet gave me a sheet of instructions about the spay recovery, and she's supposed to be at least alert and eating by now. She did eat a little, earlier, but only when we practically put the food under her nose. She's just apathetic about everything. Could the vaccines be making her sleepy?