yeah no she is mad sus, and if she's genuine here, then I hate her character, but if this is lying to fool him, then it's excellent setup. "A woman's ambition," There is so much to unpack from that wording. She isn't a woman, she's a little kid, and if this manga has any balls at all she may not even see herself as a girl. That much ambition and political know how? She very well might want to attach herself to a powerful man as a means to an end, because that may be her only viable path to power in the society she lives in, and mc has just revealed himself as talented at gauging people's talents with gauging intentions. Easy to manipulate and still useful. If this were a josei manga she'd deffo have such motivation and she'd be the protagonist and we'd see more into her head. Time will tell if she's really as shallow as she presents herself here or if she'd just gonna be a hollow shell telling the protag how great and noble he is.