She grips the wheels of her wheelchair to stop the do-gooders doing good. Nothing annoys her more than people trying to take control of the chair. Helping... Sometimes, if they’re at the right angle, she slaps their hand.
He was particularly irritating, and determined to let the world see how good he was. For years she plotted her revenge on his goodness.
She left her specially-adapted car’s engine running in the garage, called him in, asked him to help test her back-up wheelchair – in sign language because he was deaf and had lost his sense of smell. She closed the door, watched him sit in the chair, waited for him to die from behind her gas mask, planned his funeral, congratulated herself...
But she couldn’t work out how to open the garage door, couldn’t breathe because the gas mask was faulty, had an out-of-body experience in which she was running about again and trying to push him in his wheelchair. And died.