try to make some video presentation of her while at work with your group, use those old pics your officemates got and assemble it. Have your other officemates say something on a video..
Then you can have some tokens for her ( each one of the officemate give small things).
For funny moments- you can play " sing the letters of my Name " wherein each letter of her name is being described in a song .. example... letter A.. ( sing a song that starts in letter A, )
