Dating,flirting,help me no tips i neeeeeeeeeeeeeeedddd help with my situation ez 10 points?

ok so there is this girl in my cl. she is always mean to me like period always mean. she always has something to say about me. but today it was weird we were reading this play its sorta like ten things i hate about you and in the play the couple is fighting. i have a partner and it is not her. so anyway a group was preforming the script and they couple was fighting so i look up at her and she is mouthing th play to me. i was like woah then i started mouthing back and then she like bites the air at me and i thought she was being mean again so i repeat the gesture. then she just stares at me for like 2 seconds and licks her lips at me with a straight face then she stares for a little bit longer then looks away. i am confused i do not no what this means or really what just happened fro that matter plz help me. high schooler in need.