Random question im bored.?

theres this day at my school where some kids take a vow of silence for the day to support LGBT. i didnt participate although i do support them but this girl in my study that im friends with did. and ive never consciously tried to flirt with her but im kind of a naturally flirty person so i may have in the past without noticing and shes never noticeably flirted with me. but today she was definitely flirty even though she couldnt talk..which was extremely odd and kind of made me stop and wonder if i was imagining it but i definitely wasnt. why would she all of a sudden get flirty today especially when she couldnt talk? obviously it was the physical kind of flirtiness so maybe she wasnt being flirty and just over compensating for not being able to talk? and its not like shes just inexperienced with guys and doesn't really know how to flirt shes 16 and has banged like 5 guys...i dont have any feelings for her and i doubt i could ever mesh well with a girl like her but why randomly today did she get flirty?