This friend of mine has been flirting with me and I think she likes me but I don't like her like that..help?

Like mentioned, just tell your friend and let her down easy, personally Ive been the girl where the guy had to let me down easy and I am glad he did and was considerate of so said feelings. In this position girls tend to be sensitive since their doing the asking and everything. Also you can think that your almost in the same boat with your friend cause I bet she mustered alot of courage to talk to you and do the asking like I said. I am rambling, but with the girl you like just be simple and ask her something that you both have in common?? hopefully that helps?