Sick outdoor cat, cause unknown

About a month ago I posted about a friendly stray cat that wasn't feeling good, she had brown gunk from her eyes and liquidy ears that were bothering her. Except for a tooth extracted last year she was in great health for 8 years old.

Past two weeks her health declined quickly. She has been constantly lethargic, hardly eating or drinking but previously drinking a lot, I feel one day she had a temperature, and at the vets they showed me her gums are pure white she is anemic and has a heart murmur now and lost nearly 3 pounds!

They confirmed no upper respitory or ear infection, no tooth infections, and no sign of poisoning.

I've never had a cat get this sick so I'm worried, they are keeping her overnight doing blood work and urine analysis and started antibiotics but they aren't sure as of yet what's wrong with her.

What's the worst is once she's home she's back outside and can't properly rest I can't cage her or bring her in so I'm worried she might not get better or take longer to get better.

Any idea what could be wrong?

Thyroid or diabetes?

Why does she have to go back outside?

cocheezie said:

Why does she have to go back outside?

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She is a stray cat I have been caring for I already have 2 indoor cats that don't get along with her and I live with my parents and can't fit any more cats inside.

Bad news, she tested positive for feline leukemia and possibly bone cancer, they suggested putting her to sleep, I'm devastated my mind is in a fog I'm so upset. What's worse is my 2 other outdoor cats are at risk or may have it and I wasn't aware, they had a few years without vaccines due to being hard to catch. But if not I wish they can be adopted so they never have to go through this. I don't understand she was vaccinated last year and treated negative, so that means she probably contracted it soon before getting vaccinated, I don't know anything about feline leukemia.