So sorry you’re having to see this happen in the first person. It’s one thing to read about it and believe it is truly happening, and quite something else when the one sick is someone you love. Time will give you back your memories of happier times - be stubborn about bringing them to mind every day until your last sight of her is not what you see when you think of her. Remember, she’s going to a better place and the ones responsible for her loss will pay the price. Don’t let them live in your head. One day they will die with the knowledge of what they’ve done being all that’s left - to torment them for eternity.