So sorry. When you took her to the vet was both blood work and urinalysis done?
Have you tried changing her litter box or litter? Is it at a specific time of day that she does this? Does she use the litter box at all?
I would really try to get her off kibble, it really isn't doing her any good. Here is a good website to read:
Cat maid to:
Jasper, male Ragdoll ?? (approx 10 yrs)
Rose semi feral, a cpietra rescue, female tabby (approx 7 yrs)
Sweet Pea RIP (2004?-2014)
Puddles RIP (1996-2014)
Snowball RIP (1991-2005)
In a cat's eye, all things belong to cats.-English Proverb
“While we are free to choose our actions, we are not free to choose the consequences of our actions.” Stephen R. Covey