eh... maybe, if you don't pressure her into having sex with you. If you are even thinking about sex before she is 18 you need to check the laws in your location. In some places it is illegal for you to have sex before she is 18, and the consequences could be severe.
I don't think you should date her. I believe you guys should stay good friends for a few years and allow each other to grow and then make your decison. You both are young and trying to find yourselves.
lol at people here saying she's not ready for adult stuff. I remember my middle school days like they were yesterday and everybody around age 13/14 were talking about their sexual experiences. She's not a little girl anymore, but still that doesn't mean she's mature enough for you. Whether the relationship will work out or not depends on the maturity levels of both of you. So if you love each other go for it