Aragog, I'm very sorry for your loss. I hope that the decision that your Nan made to visit family brings some comfort to you and yours.
On the subject of 'another 2 years lost', in a way, lots of us have already been through that. I was seriously ill with a potentially fatal condition. It took me 2 years to get through operations, additional therapies, incapacitation, and brought with it all the emotional, practical, and financial hardship you can imagine. It seemed never ending.
But here I am. Recovered, pray to god, back on my feet. I've done some of the things I wasn't able to. Been on holiday, late nights, long walks, catching up with family across the country. Some things, from having another baby to rock climbing, I'll never be able to do. But I'm here, I'm counting my blessings, and drawing on that experience I know that this too shall pass.
It will pass for you all too.