(a) Danielle does not appear to be in any way OCD, in spite of the occasional reference to flicking a light switch multiple times. Major anxiety issues, yes. PTSD from an event in junior high, very likely. OCD? I doubt it. 
 (b) At one point toward the end she mentioned prom or graduation and I was completely confused, because she's only in 9th or 10th grade. Nope, she's really a senior, but reads much lower than that. 
 (c) The Big Lebowski becomes very important to Danielle in the last third or so of the book, but without much explanation of why it resonates with her so much. 
 Overall: not one I'd recommend to teens; those interested based on the title would be better steered toward Lexapros and Cons (which had a similar thing going with the Chuck Taylors and did it far better).