She tells you to not tell anyone, but that she wrote the penissizedebate site.
Seriously though, many signs can indicate she MAY be a size queen , such as her overly staring at bulges, or making small remarks about guys that drive certain cars, or hinting that she wonders what you have, or her saying her ex had a big dick but didn't know how to use it (a woman makes that statement not even realising that by that remark she is indicating she considers a big dick an advantage if used properly). I believe about 10% of women are bona fide size queens, so if a guy isn't hung the odds are in his favor. Of course a woman can still have a preference for big without being a size queen, but at least she won't make an issue out of it.