A little girl who was accepted into the Assassins guild in the first place. The point is that these people are stupid as fuck to believe and spout that trite line of “She’s just a little girl” given the situation and the nature of the attack she just pulled out not seconds before. “Overwhelm her; Be on your guard for that weapon; Rush her; Don’t let her run; We can overpower a small girl” Any of these other statements work much better in this case because it’s an overestimation of their own abilities, not an underestimation of hers.
Regardless of the possibility of an overblown story, they heard about her from a torched beggar, the guild is confirmed to be eradicated, and she stands unbothered and uninjured RIGHT after picking the fight despite their numbers. The common sense here is at that moment, to some extent unknown, she is anything but JUST a little girl.