I can't give advice on what to do, but if you do end up going out with her, don't let her go. Ever. It will end up as one of the most awkward friendships ever, especially if you come to regret letting her go later on.
LIES. One of my exes is also now one of my best friends! The whole 'dating' thing helped with that aspect 'cause afterwards we knew eachother better than before.
(there was like....a month of not-funness, but whatever.)