User blog comment:VedranTheII/Pretentious Diaries 2: What tricks would you teach your Aura?/@comment-26512661-20150718155058/@comment-24891101-20150718235554

Possible, but unlikely. Because it's her first assumption, that means that glass weapons are plausible in-universe, and thus are the simplest explanation. Besides, she's a Hunter, and therefore reasonably familiar with Dust, if not having intimate familiarity.