Like Barbara said, don't give up just yet. She's young. My RB Mollie Rose had kidney failure. She went down hill fast, losing 4 pounds in less than 6 months. The one thing to keep in mind is whether or not your kitty is in pain. Mollie Rose was. She'd lay near the water fountain and yowl. I asked the vet if there was anyway we could make her better and he said, "I'm afraid not." She was 16 years old when I had to make the decision to have her humanely euthanized. She was my very first cat and it broke my heart. But I knew it was time and do not regret my decision.

I'm so sorry you have to go through this. You and your kitty will be in my thoughts and prayers.