Horsemen is right. You really should think about it. If you don't like the idea, then don't try to dance around the subject. Just let her down gently, and give her a reason why.
If you feel the same feelings she has then do what is right. But first know if when she says she loves you if she is saying it in a serious love way or a friendly and/or brotherly sisterly kind of way.
My friends tell me they love me all the time. But we do it because we are so close. Like sisters. Sisters say i love you all the time. It might be because she thinks as you as her sister.
It's normal if somebody falls in love with you. There is nothing wrong with that. If you like her then it's a win-win situation. If you don't, ignore what she says and continue acting the same way as if you don't know that she loves you.
