I think one of the best things you can do for someone who has lost a loved one is to recount your favorite memories and stories of that loved one. Even if you spent hardly any time with him, maybe talk about some of the things she's told you in the past? Get a card with a yellow rose on the front and write the stories down. Or, even better, if you have time, buy a blank notebook with a yellow rose on the front, and have as many people as you can write down all their memories of her husband. Holy cow, I would love it if someone did that for me if I lost my husband!!