Poorly Puss

My wee Rowan cat is not at all well. She suddenly lost her balance and can't walk without falling over . Very upsetting to watch. The vet says it's either idiopathic vestibular disease similar to a stroke in humans or a brain tumour . It seems it's a waiting game . If it is not a brain tumour she will recover in a few days.
Hoping for the best for her. She is quite old but we are not at all ready to lose her.