One of my best friends is flirting with me.?

Well she's in the grade above me so i don't see her much in school but we always text each other in cl and we're always hangin out together after school. And she always invites me to go to out to eat with her and to go see movies (just the 2 of us) and even go skiing together in the winter. Is she just hangin with one of her guy friends or does she want more than just friendship. I'm confused. I don't want to mess up our friendship but going out would be nice too. She's really fun to hang wit and smokin hot. And we always flirt with eachother but shes seemed to take it to the next level lately with the flirting (you know more often, more personal, even more ual)