I see by your diary that you've done some topping on this... and, quite honestly, this may be your problem - autoflowers do not take kindly to major stress such as topping (some get away with it to be sure but most do not). The stress this caused your plant may have interrupted it's pre-programmed schedule of events. Not much you can do now except wait to see if she WILL go into flower - but I would say if she hasn't started within another week, she probably won't.... but give her at least two weeks - you may luck out.
Good luck!