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Just talk to her, dont say any wack shit. You can pretty easily tell if shes into you or not if she initates conversations/topics and laughs at your jokes.If your ready to ask her out or smth just do it casually and if she says no just play it off. Also idk if this would work for you but I showed tons of girls my dorm where I have posters of Rb all over the walls and they all fell for me immedatley (due to Rb aura)