I am sorry to hear about your health, my god father has ms (diagnosed at 38). I say keep the car. Life is a ticket game, there are too many tickets that make us unhappy so we need to hold onto all the ones that do the opposite, it makes you happy then thats all that matters...
A friend of my fathers lost his leg and foot (diabetes), he rode motorcycles his entire life, and even before they amputated he had to stop riding due to the disease... He sold his evo but has a gorgeous panhead, about the nicest 52' I ever seen in my life, he can't ride it obviously, but his sons remodeled the dining room to be a shrine to the bike, lol... They have the bike(exhaust piped out so he can start it up in the house) in their with some seating, pictures of him and the bikes he had over the years, I havent seen it personally but my father said its awesome and so well done..
Anyway, he sits in there and watches TV, just being near the bike makes him happy, its not all about the ride, I have guns I will never shoot, I have guitars I will never play, and vinyl albums that I wouldnt dare laying a needle on, all things that make me happy, its YOUR car, don't feel guilty about owning it for a second, I am sure you worked HARD to get it in your garage, there is no shame in letting her stay there for the sake of your smile...
similar to this but his has a custom rawhide/leather wrapped seat with the metal showing through in some spots...