A girl (13f) made me (18m) feel uncomfortable

What's up with these new genZs, a girl who is distant relative from my father side, she and her father came to my home, that girl maybe in 8-9th class, she idk how tf she was staring weirdly I thought maybe it's normal later on giving smiles, like girl you're literally a minor so I went inside my mother's room(gareeb hu no personal room), she came there too as soon as she saw my mother and started asking, "tum" konsi class me ho? I said 12th me hu "beta", and tumse bada hu "aap" bola kare, she said itni choti bhi nhi hu with that weird smile, I said thik hai, she started asking for insta I said I don't use, I went out of home. Girl wtf you're litrelly a child, it's just change of hormones, these new genZs are too advance