It wasn't really a problem at first, but around half way through, I noticed that you put a lot breaks in between parts. I know that it's a style and sometimes it's better to show than it is to tell, I personally think it's too much. You could replace some of them with a sentence or two, saying something like, "Ginny then proceeded to tell Luna what happened." Pauses like that, that can be replaced with a sentence or two, should just be written.
Aside from that, I like how you stayed true to the initial feelings of Ginny, the dislike. I'm interested in seeing how it changes.