did something really happen between shelby and daniel?

No, nothing happend. Read that last couple of pages and LK Ответы the Вопрос 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, Ты 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 Чтение 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 Вопрос directly because it's in the book. Ты are NOT the only one upset about this! Ready Passion, Daniel has eyes only for Luce.