did something really happen between shelby and daniel?

No, nothing happend. Read that last couple of pages and LK respostas the pergunta for us. Shleby tried to get Daniel after but he rejected her because he loves Luce. Shelby's just pissed that she didn't get her shot. but through out the 2 and 3, she let's go of it and becomes loyal to Luce. So no nothing happend but that one night, even though I am still doubtful, I think she made a pass and just, you know, got rejected. Especially after Daniel sneeks into the school and sees luce, Shelby runs out of the room pissed off. There is your answer. DANIEL REJECTED SHELBY! Like i said, keep leitura towards the end, even Shelby thinks about Daniel's rejection of her.
Shleby had a cruh on daniel, which of course was unrequited. That line is in the Book. Answer #2. Nothing happened, LK doesn't answer this pergunta directly because it's in the book. You are NOT the only one upset about this! Ready Passion, Daniel has eyes only for Luce.