While it's impressive to rise 12 levels in a day, she's still not too smart to blurt all that out. She's afraid of revealing her status as a duke's daughter from a neighbouring country, which is wise, but suddenly she's not afraid of revealing information that seems odd coming from a newbie adventurer. Not impossible, of course. Others might as well think she's the daughter of some famous rank A adventurers and has heard all sorts of things growing up, but in such a case, again, why would she suddenly spill the beans like that? I suppose she forgot she's not in a game anymore, she's living in a fantasy world already. Yet she didn't forget that when hiding her noble status. Go figure. She's just a little stupid.