It's an early trans but what she ment is that she's surprised that there is someone else than her that has the Dragon Eye(cuz Shin and his parents are dead).
Here she used it again:
Here that dude realise that she has it, also due to rumors:
^She wasn't using it but she might have use it during their fight:
Here she noticed that Tsumuji snaped silently:
There might be more but I don't have time anymore.