MESSAGE!
For right now, DO NOT tell (or show) her that her feelings for you are not mutual! What you're feeling could easily be a temporary resistance to commitment. Which is normal when a man is in transition from single life to a committed relationship. We (men) wish for the girl of our dreams, while single, but generally choke when we have to confront all the compromises, responsibilities and discipline we need in order to accommodate our dream girl when she arrives. It’s not a cause for concern… just nature taking its course.
Still… if you express to (and subsequently crush) her with unsubstantiated rejection when she's at her all time high in love with you and then you realize later that you DO want to be with her... her pain, lessoned sense of value to you and fear of abandonment with you will dog your potential relationship. Women are emotional beings, whose feelings have to be nurtured, protected and supported for them to function in a relationship at their highest level of efficiency & happiness. It takes SO much for women these days to be willing/able to really go all out for a man the way you're describing this woman does for you... That effort has to be rewarded. Period.
Give yourself some time to do a little soul searching, but do all that you can to support and reciprocate her love for you in the meantime. If you later discover that she is truly not the one for you, she will still be hurt, but at least your loving manner of ‘letting go’ will be defensible and chivalrous. If you discover later that she is the one for you, you will already have a firm foundation to keep building on. It’s a win/win situation, if you take my advice.
Lastly, I don’t know your girl, but she sounds like she’s a keeper… More so than 90% of the women I see out here on the single scene. It doesn’t get much better than what you got. If you don’t want her… PM me her info and I’ll take her… depending on her looks & sexual skills, that is.