Hey Frantic 1
I am so sorry for the circumstances that caused your loss.
Take comfort in the fact you did your best for her .
Once you have your outdoor cat enclosure sorted, have you thought about getting a new companion for your surviving cat?
It may be a way to move on,knowing you are trying to help him adjust. Cats are wonderful creatures who I believe can adjust and help us to do the same.
I have had many over the years and have found as long as they have plenty of activities they adjust well to a life indoors.
Did you know that a desexed indoor cat lives a lot longer than one allowed to roam?
I am with you in your grief.My best ever cat Tigger( yes he was a ginger lol) died 20yrs ago and not a day goes by that I don't think of him.
I wish you well If you just need to vent or talk about your loss,I am here.