I'm sorry to hear this, @StarryDream. It's okay that she unfollowed you, after all, it is her loss.
I think the best two things I think that you could do is:
Ignore her. This is just an internet friend, it's not a huge deal and it's not real life. Forget about this, and move on!
Apologize and explain why you unfollowed her. Tell her you didn't mean to hurt her feeling, and that you don't hate her.
Personally, I'd go with #2 so nobody is sad. This could all just be a misunderstanding. If Graceful Stars continues to say things like that though, you may just have to ignore her.