I would say you should feel it out a little bit... She wants to get to know you better, and thats always a good sign. As your learning more about her, find out what she likes in a potential guy... See if you guys are compatible. If your not her type, and shes not looking to you for that kind of relationship, you didn't lose anything, as you're still good friends. All my best friends have always been female. When I first met my current Best Friend, I would have sold my internal organs to get with her! Now, I can honestly say, I love her more than any girl I've ever known... Even more than a girl I was gonna marry, and she feels the same way about me, BUT... I don't think we would ever move into a romantic relationship, because love aside, we aren't each others type.
If things work out for you guys, and your both interested in pursuing a romantic relationship with the other, CONGRATS! You just "hit the lottery" so to speak, cause you guys are already friends, and you have nailed down the most difficult part of any relationship!