Hi! I'm from outside the Seattle area and facilitate a not-so-succesful support group about an 1 hour north of you.
Have you contacted the Lupus Foundation of America Pacific Northwest Chapter? Just google it and call their 1-800 number. Kathy is the executive director and Humaira works in the office. They can tell you the Seattle support groups. Also, in the newsletter they are all listed. I haven't attended any in Seattle, but I know there are several, including one in Shoreline, as that is where the LFA office is. If my support group flops (I'm still trying to figure out what to do) then I might start coming down to Everett or Shoreline.
Good luck and let me know if you have success or any more questions!