My cat is about 11years old ( shes a rescue cat so not 100% on age), she now has no interest at all in going out. She stays in all day grooming herself and sleeping, so shes bringing up alot of fur balls. any advice please

Vet, vet, vet, vet, vet!!!

Please take her to the vet - hopefully it's nothing too serious but we really can't safely say that

Book her an appointment and fingers crossed it's nothing to worry about!!