You'll need to give some more specifics if you want any good advice. What are the ways you've tried to show you love her? If it's just buying her gifts, comforting her when she's down, helping her out when she needs advice, and stuff like that, then watch out! She might have stuck you on the Friend List.
But then again, this is all speculation because I don't know any specifics. Tell us what you've done and said, and how she reacts to you - We cannot help you interpret signals if we don't know about anything she has been doing or saying to you.