You’ve provided help already for this cat, by outlining issues which may arise in her future care, and I presume how you/ your vet resolved them. As I understand it, it is not that you do not wish to give this cat a home, but you recognise the potential problems which may arise as ‘Miss’ Penelope doesn’t suffer room mates gladly.
Your shoulders are only so broad, and you carry what you can.
P.s. I have to add that Penelope is looking very well, and happy.