It's actually a mixed race cat... but here we go.
She has stopped consuming food, drinking water, reducing her way to the sandbox, and also has a yellow looking skin color. ¿What I can to make her eat more?
You should take Maat to the vet urgently because when Maat does not drink,she could die by deshidration.If her skin is yellow,then she can have a hepatic problem.
The vet will do an examination to get a diagnosis and prescribe a proper treatment.