Have Cat Questions? Ask a Cat Vet Online.
I am sorry to hear you are worried about your cat. I am a veterinarian and will do my best to help.
You can give Benedryl, 5 to 10 mg, to cats.
Can you take her temperature? Normal rectal temp is 101 to 102.
If you look at her gums, are they pink in color, or do her gums look pale?
Usually for vaccine reactions, I give a cat steroids like dexamethasone or prednisolone, but you would need a veterinarian to get steroids.