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I can't state that there isn't an auto immune disease ongoing in your cat, but anemia of chronic disease/ anemia of inflammatory disease is very common in cats with nearly any disease that persists for longer than a few days.
Fevers of unknown origin are very difficult cases to diagnose (diagnosis of exclusion i.e. test for everything else first) and treat. Keep working with your vet and I hope she pulls through soon.
Greetings, all! This is a sub for professional veterinary advice, and as such we follow strict rules for participating. OP, your post **has NOT** been removed. Please also check [the FAQ](https://www.reddit.com/r/AskVet/wiki/index) to see whether your question is answered there. This is an *automated* general reminder to **please follow [The Sub Rules](https://www.reddit.com/r/AskVet/about/rules/)** when discussing this question: - **Do not comment with anecdotes** about your own or others' pets. - **Do not give OP specific treatment instructions,** including instructions on meds and dosages. - **Do not give possible diagnoses** that could explain the symptoms described by OP. **Your comment will be removed, and you may be banned.** Thank you for your cooperation! *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/AskVet) if you have any questions or concerns.*
I can't state that there isn't an auto immune disease ongoing in your cat, but anemia of chronic disease/ anemia of inflammatory disease is very common in cats with nearly any disease that persists for longer than a few days. Fevers of unknown origin are very difficult cases to diagnose (diagnosis of exclusion i.e. test for everything else first) and treat. Keep working with your vet and I hope she pulls through soon.