Do you have any poems that might help to give a very dear friend some courage and strength at a difficult time?

I have a very dear friend who is seriously ill at the moment and is going in for surgery in a week or so and is anxious and scared. I would like to send her a poem or something like that to give her a bit of a lift and I wondered if any of you have any favourites I could pick from. Any ideas gratefully received. She isn’t a close friend but she is a special, special person. One of those wonderful, warm, kind people who make the world a better place.