Well, I dunno, she probably guests about as often as anyone who isn't Supes or Bats or Spidey or Wolverine. Hrm. Except she doesn't circle around Donna the way she should, due to the incredibly crappy decision to split those two and have them meet as adults. She should have been getting side-references in Darkstars and Titans and GL over the years that she never did, because her sister spent a long period having nothing whatsoever to actually do with her.