What should i do, please help!!?

When i was in 5th grade there was this girl i really liked. that year she would move to another town. I thought i would nvr talk or see agin after that. Four yrs later (now) she has come back into my life and is going to my high school. She obviously dsnt remberb that i had a mive crush on her and says we are going to be great friends. im confused on which i still like her or not. i cnt tell her i like her because that would **** up our newly found friendship. wat should i do??