Any suggestions on maintaining a platonic thing?

You have hit a clic problem with male/ female friendship and personally why I don't think it always works that well. I would say distance yourself a bit from her and give yourself some space. If she notices and asks what up, just be honest and say you were concerned you were developing feelings for her but just wanted to remain friends so you needed some space to sort your head out. If she is a good friend she will understand and empthise because what your experiencing is not uncommon and simuliar I imagine has happened to alot of people.