Does she like me or is this just a best friend thing?

I went through the same thing with my best friend. Exactly the same. The girl I like now did too. That's how a lot of girls come out as lesbian or bisexual. What you have to do is make a stronger move. Talk about how it would be to be with a girl or something like that and see what her response is. I found out that my best friend liked me too. We both recently came out (she's bi, i'm a lesbian) to eachother. We're more like sisters and I can't imagine thinking of her like that anymore. I feel as though we were so close that that was a way for each of us to discover who we really are. If your friendship is that strong, creating a relationship could either be a great thing, or you could completely destroy it if you break up. Either way, you'll never be the same. Take this into great consideration and think about it a lot. Good luck either way!