I’m so sorry.
She knows you were trying to help her.
There wasn’t anything you could have done differently.
I lost my big maine coon baby about 2 months ago.
Give your other cat extra cuddles. Our black cat still wanders and looks for his big brother.
*hugs*
Much sadness for you. While it is true that her life here was good for you both and that the only condition of coming here is you have to leave, that is little enough comfort at present. But, it will be as you look back. May God give you peace and happiness as He as given her.