Bobbie is in the first seat on the left in the front row in this photo of Past, Current, and Future Worldcon chairs taken after the WSFS Business Meeting at this year's Worldcon; I'm standing right behind her.
Of personal import to me, Bobbie was chair of the 2005 NASFiC where I was Fan Guest of Honor, and effectively when I started this LiveJournal. (There are entries before that one, but only a handful, and it was CascadiaCon where I seriously started making entries, with a goal of at least one per day.)
My thoughts are with Bobbie's family and friends today. This is a terrible shock and very unexpected.