My cat has DEPRESSION!

That's really sad. I think the vet is right. That with time things will get better. Unless you want to get another kitten so Lucy has a new playmate, you will just have to wait it out. Good luck.

I feel sorry for you and your cats, but agree with your vet that time will cure your cat's depression. In the meantime, you should continue to try to play with her and continue to do things that she likes. She probably won't respond right away, but will likely intuit that you still care very much about her and respond in good time. It's hard being patient, I know. I'm going through a similar thing with my Mimi, and my patience is being tested daily. The cat is still holed up in the closet and growls at me when I check on her. She's brokenhearted over losing contact with her master and home.

Oh that is such a sin, I feel so bad for your poor cat. Maybe if you tried holding her and comforting her more that you usally would it might help her to feel a bit better. The poor baby. That makes me want to cry.

Time will cure it. My oldest cat passed away a couple of years ago, and one of his sons was upset by it. He loved the daddy cat, and would follow him around everywhere he went, lol. He eventually got over it, and I've found that he does so many things like my cat who passed.