Aira is in the position of "teenager suddenly in a foreign land, far from her family, friends, and whatever support she was familiar with, with people expecting a lot out of her." She's latched on to the friendly faces around her who are offering their help and support, who happen to predominantly be engaged males—which is maybe slightly peculiar, but it isn't unusual for a girl from her culture to have male friends. Certainly some level of propriety is expected in a platonic relationship, but the thresholds she's used to are not necessarily the same as what is expected in this new world.
Is she making optimal decisions, even taking into account the limitations of her knowledge? Not really, no. She's just a child, though. Certainly, that doesn't stop her from being especially competent or talented in certain areas, such as navigating the politics of a pseudo medieval French magical society, but she can't really be blamed for not excelling at such either. Not every kid is a plucky young heroine just waiting for an adventure to drop into their laps so they can show off their cunning, know-how, chutzpah, and determination.
