It may be sign of urine system problems and kidney failure... Take her to vet immediately...
I think that she might be scared as well!! Just just in case take it to the vet it might be sick and doesn't want to drink !!! Cat flu has been going around see what the vet says?
She is scared of something or she is finding the environment unhealthy for her. No cat hates to drink. It is their need. You have to change her environment. She will be fine soon.