It just sounds like she has moved on since high school. She's gone off to college and she's grown up-- she's explored new interests, learned new things, and made new friends. As a result, she's drifted away from you and probably other friends and other interests she used to have in high school. It's no one's "fault." It doesn't make her manipulative or a bad person. It's just something that happens when we grow up. Of the friends I had in high school, I'm only still close to one of them and rarely talk to the others. Why? We just don't have much in common anymore so it isn't that fun. They're still nice people, we just don't "click" anymore. I would rather spend time with the friends i have more in common with and have more fun with.

Can you just appreciate your friend for the great times you had in high school-- appreciate that she was once a great and important friend-- and it was a meaningful relationship? And now, can you put your energy into making some new friends, who you might have more in common with now? Just like she grew up, you probably did, too. What are your interests? Hobbies? Career path?