Friendship problem; What should I do?

So, let me explain the situation, this girl who was my best friend in grade seven (we’re now in grade 10) is still one of my good friends even though we stopped talking for no apparent reason in grade 8 and most of grade 9. My problem is, she isn’t like any of my other friends and in my eyes we don’t have as much fun as we used to nor do we have as much fun as I have with my other friends. She also seems to think that the world revolves around her, and whenever she is free to hang out I should just drop everything for her. I wanted to bring this up somehow with her but thought I might get some advice first. Any thoughts or advice would be greatly appreciated.