Quality of life is the most important thing. Is she happy? She is eating drinking and using her litter box normally, is she doing the other things in her life she normally enjoys?
Has either vet considered that she may have Vestibular disease (inner ear infection)? The symptoms resemble stroke quite a lot. Has either vet tried a course of antibiotics? A couple weeks of Baytril maybe?
Hasn't any vet taken her blood pressure? High blood pressure can cause stroke or stroke like symptoms. There is a medication cats can take to reduce blood pressure.
Was her thyroid tested, when they did the blood work? T-4 is the test that is most detailed and accurate for hyperthyroid disease. Hyperthyroid can also cause stroke or stroke like symptoms.
Steroids are an anti-inflammatory. They are often prescribed when cancer or a tumor is suspected, because they can help reduce the inflammation, making the cat more comfortable. But they can have side affects.
I understand not being able to afford an MRI, and if you did find out she has a brain tumor, would you do anything different?
My advice is to give her the best quality of life possible, love her, love her love her, and when she tells you she's had enough, let her go.
Talk to her about her suspected illness, tell her you want only the best for her, and tell her, when she is ready, she should let you know, and you will honor her desire to be set free.
But it certainly doesn't sound like she's even close to ready for that yet.
Declawing: please read this first
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