Haley is a girl that values appearance above all else, which makes her come across as quite arrogant. She keeps up with all the latest fashion trends and is good friends with Alex. Not many people know that she has a passion for photography and so loves to take lots of pictures of the wildlife with her camera. She also cares for her sister Emily, despite them being polar opposites. 

For Haley I'm thinking of a somewhat valley girl voice, just not too forced. 

This is a character who rarely shouts.