Up until she was 12 she tried to tag-along with her older brother, and his best friend. To them she was just an annoying tag-along.
Then she gets a crush on him.
So she thinks her best option is to act Iike she hates him, and that's what he think, her brother even thinks she hates his best friend.
Worst of all he's always at her house hanging with her brother.
Even if he felt the same and they were to start going out, her brother wouldn't like it. He can get protective over her when it comes to dating, as much as he trys not to.
So for 4 years she's had a crush on Conner, but to Conner and her older brother, Bryan, she's just a tag-along.
So she thinks.