Just look at her actions. You know her well enough and know that she doesn't want to talk to you or tries to find some way out of it.
Of course, she couldn't just come out and say that, she would feel guilty or bad about it. So as much as it hurts, you will just have to leave her alone and find other things to do with your free time. Hang out with other friends that will enjoy your company and not take it for granted as she is seemingly doing. There are many reasons why she could be giving you the cold shoulder, but if she isn't giving you any there is no point in really wondering about it. Maybe you could look at yourself and see if you were around too much. If it were say a guy friend and you weren't in love with him, would you give him the same treatment? Just some things to mull over.
But yeah, basically you just have to leave her alone and maybe she will miss what she had before. I know your devotion to her was very thoughtful and kind, she is lucky to have somebody in her life care about her that much. But if she doesn't want to be you, no matter what you do will not change her mind on this. Give her time apart to miss you is all I can really tell you.
Waking up next to a beautiful girl,
Step outside and say hello to my beautiful world.