The setting in the story seems to make it very sad and tough on Rain because she had an old friend get murdered in the park.  She also has some other things that seem to be bothering her like they recent party she had gone to.  She had also had a dream about a party and her friend Wendy had fallen to her death while she tried to scream to everyone to help but her speech problems made it so she couldn't be understood and was laughed at.  She also lives in New York and the crime rate is pretty high.  She also had a paralyzed grandmother which might have an effect on her mood.  She doesn't have many friends either and that might mean she is more shy than others.  I've noticed in the book her dad is never around so maybe he passed away or left her and her mother.  When she herd about her friend Wendy's death she sort of shut down for a while and was in a depression stage.  She wanted to hear Wendy's voice again so she got on her Facebook and watched some of her videos.  Rain's mom is always trying to make her happy but it almost always seems to backfire.