Why not a lunch in honor of X and her husband? Everyone bring some food, or else hold it at a restaurant - though your coworker/friend would probably prefer it not be terribly public.
If you knew anything about her husband - things she mentioned, impressions you received - speak about them and say, somehow, how you feel for her and want her to know you're with her. All her friends/coworkers would do the same.
I think a bouquet of flowers to her, or the presentation of a receipt for a donation in the departed's name to a cancer research center would be a good finishing touch.
The benefits to this would be:
1. She would have the ceremony and all its cathartic properties.
2. At a difficult time, she would be assured of friendship (If she's nursed a husband through a terminal bout of cancer, she needs this)
3. It helps all of you by giving you a way to help her.
I hope al is soon well with her.
Nothing in the history of mankind can foul things up quicker than a computer
......with the possible exception of tequila and handguns.