Is She Bi?

My dads friend came to my cousins wedding..He brought his girlfriend..She didnt drink beer or wine..Ive never even seen her before neither has my sister and cousin..We were dancing in a group and she cam up to my cousin and started to like dance with her rubbing against her ..Then later she dnaced with my sister like twirled her around..I was dancing with my Bf and My Bf went to get coke..So she came and rubbed her on my leg...Shes like 43 or 45 and we are 13 14 and 16..Im 14 my cousins 16 and my sis is 13..So Is she Bi..She kissed me on the cheeck in the bathroom..Then grabbed my ..