User blog comment:JERealize/Progress Bar: Issue 007/@comment-1874924-20130418052452

OK, I'll explain the joke. Heather described her association (however reluctant) with the organization, and the attendant horrors that she'd seen and been part of, as "madness". Her former reality show colleague, Izzy, was the personification of madness as far as Heather is concerned, hence the  inspiration for Heather's new "witness protection" name (as opposed to her new undercover/code name, which is never mentioned). Basically, Heather chose the name "Izzy" in a moment of whimsy.