I second the UTI. Blood in the urine is a big sign. They need antibiotics to clear it up. You should try a different vet since your current one missed something so common.
Urinating outside of the litter box is another common sign, because they start to associate the box with the pain of going.
What is she eating? She should be on a totally wet food diet, no kibble, to keep hydrated.
Save your money on anything that's not proven to work and instead address these proven solutions:
1. Wet food only for hydration
2. Cat Drinking Fountain (did wonders for my kitty)
3. Antibiotics
Urinating outside of the litter box is another common sign, because they start to associate the box with the pain of going.
What is she eating? She should be on a totally wet food diet, no kibble, to keep hydrated.
Save your money on anything that's not proven to work and instead address these proven solutions:
1. Wet food only for hydration
2. Cat Drinking Fountain (did wonders for my kitty)
3. Antibiotics