That was so touching. She knew that she was loved.
I'm sorry for what you are struggling with. I know that when I have been at my lowest points that my cats have been there for me. This morning I was sitting outside with my feral Arwen, and I was on the phone, crying, and talking about problems my oldest daughter is having, and Arwen has never seen me, or anyone (I think) cry, and she didn't know what to think of it, but she was very in tune with what was going on. She jumped on my lap and was just staring at me, trying to figure out what was going on. Cats just have that ability to be there for you when you need them, just like you were there with your sweet little kitty.
I hope that things get better for you and that you have people to help you and talk to you. I did not watch the video yet, I know it will make me cry, but I plan on watching it in the morning. Thank you for saving the poor little Tsuki and for showing her what it's like to be loved.