oK, You've know her for 5 yrs? so you must be somewhat comfortable with her right? If you are absolutely not sure if she feels the same about you then drop some lines to her. Maybe flirt a little more with her,,,,see if she flirts back. Or just ask her if she likes anyone. Or you could just get to the point and tell her exactly how you feel.
If it is too hard for you to do in person, then maybe try calling her on the phone, sometimes that is easier. Good luck and I hope it works, sounds like you really care alot about her
