M.L.
Well, when my dad died, it made my mom feel better when his old friends and such sent her 'thinking of you' notes and wrote down little stories of their adventures together. However, some people became needy and called my mom a lot, wanting her to comfort them, hello she was the new widow! It got a little ridiculous with some well intentioned people.
And while asking for photos would be nice, it's a heavy thing to ask right now. I would wait a bit for things to calm down. It can be hard to go and look through old photos, scan them, or get copies made and mail them off so soon. They are likely still going through her things, making arrangements for her children if she had any, selling her home if she was single, going through her will, and trying to grieve at the same time.