She might have an idea, but it's just as likely that she doesn't.
I think if you want to pursue a relationship, you should tell her & not expect her to guess your feelings.
If you dont tell her , its not going to develop into anything more. You will stay friends.
Even if you believe that she already knows, do know , that if you dont say anything reagrding it yourself, it will indiacte that even if you feel something, its not high interest ,not enuf to be persued and she will move on.
I do think you should tell her-yes, she might already know, but it could be a surprise for her as well.
I have a different opinion than everyone else, probably because I have been on the receiving end of the "I'm into you" declaration and have NOT felt the same way.
I really like this advice. I agree. If you've known one another for so long, you can test out the waters a little bit without declaring it. She'll be receptive, or she won't be. From there you can make a better assessment on how to proceed.