Does my best friend's sister like me?!

My friend and i have known each other for a while and have been good friends for about a year. I'm 16 and he's 17. His sister is 15 and I've been talking to her for about a month. I was over their house last night and there was a few friends over there and we were chillin outside. Then I said "we gotta check out the Butler game" or something and she said ok ill go inside with you.. So then it was just us 2 inside and she asked me why i broke up with my ex (who she is friends with), and I gave her some stupid response, and then I asked her abour her ex (who is a friend of me and her brother) . Then two other people came inside and we were still talking, and she said wait come over here i wanna show you something... She brought me into a small office room with a map of colleges she actually wanted to show me, but then we were just chillin in there talking... there were a couple times when either of us ran out of things to say and I felt like both of us were trying to think of something to say so we could stay in there...that's just how it seemed for me. I wasn't going to try anything with her then cuz we were just talking but when I spell it out like this it seems like she likes me--She came inside with me away from everyone else... then when 2 more friends came inside she asked me to go to another room with her.

What do you think, was she leading me on or is it possible we were just talking and im just over thinking it??