Sorry to hear this.
Pets are part of the family. It is so unfortunate that they can not age similar to us.
The great thing about dogs and cats is that they do not care if you are pretty, hansom, rich or poor. They just want to be loved, and in return they give the same love and devotion back.
Just rest assured she knew you loved her, and was greatful for the good home.
Our oldest cat is 13 now, and starting to decline. My eyes swell up thinking about it. All you can do is continue to love them and enjoy the time left.