Aira is still basically a child: she's used to having someone else (her parents, her teachers, someone in authority) tell her what she needs to do. Here the prince has been telling her what she needs to do, so she's gone along with him. Even when the girls complain to her, she just gets confused: the prince has been telling her that she's doing the right thing, and he's her authority figure right now.
Also, the various men are coming to spend time with her: she's not seeking them out. Even if the other girls get upset, Aira has no idea how to handle it. She's not doing anything to cause the situation, so far as she knows. What do they expect her to do about it? Yes, it's obvious to us that she needs to take the initiative and tell the men that it's inappropriate for them to act as they have been, but that simply doesn't occur to Aira.
She's not a bad person. She's just sheltered, and has never been taught the concept of making her own choices.