I'm gonna be blunt here. Not trying to sound attacking (I've seen a couple posts on the HS Forum get out of hand).
She's not interested in you. Don't look too much into her texting you first. You are so deep in the friend zone now, that whatever her texting you means, it isn't what you are hoping for.
You tell her your feelings, and her response is that she has feeling for another guy that doesn't like her. If she liked you, she would be jumping at the opportunity to move on to someone else. Instead, shes either choosing to be exclusive to, well.. nothing..... or she used it as an excuse to let you down easy. Hint: it's the later.
What really screwed you over was helping her when she asked for advice getting another guy. DON'T EVER DO THAT! Not only did that put you so deep into the friend zone, but you probably gave away some of your ideas you could have used on her yourself. You became the person she can come to when she wants help with OTHER guys. Meaning, she won't be coming to you for you.
There is a reason why being in the friend zone is so hard to get out of. Especially when your game isn't completely on point. Any "moves" you make at this point aren't gonna be "cute" or "funny" or "sexy". They are gonna be "weird" and "awkward" because of where she has placed you in her mind. Her guard is down, but not because shes open for you to move in. More because she isn't entertaining the idea of it at all.
It is also a tough situation now, because the best way to make your move will either work, or probably end your friendship. And that would be a lot of what NorwegianDJ mentioned; freeze out for a while, sexual innuendos, kino, and SPENDING YOUR TIME WITH OTHER GIRLS.
I can't stress that last one enough. You need to show her that you aren't some stuffed toy she can carry around that will respond to every text and answer every call just because she wants the attention. The best way to do this is to spend your time with other girls that are interested in you as more than just friends. It will show your worth as more than her emotional tampon, give you a chance to work on your game, and maybe most importantly: get your mind on some other people. That is your best bet for her attraction to grow, and if it doesn't, you then have other options and you simply won't care nearly as much.