Sarah Hillmer’s latest work notebook is mauve. Or maybe, she says upon reflection, it’s a light purple/lavender mix? Hillmer is very particular about her notebooks. Each ballet she has worked on as a rehearsal director, stager or assistant to the choreographer — and there have been dozens — warrants a notebook of a different color. Each one is a lined composition book from Walmart or Target. The mauve one is for Crime and Punishment, choreographer Helen Pickett’s new full-length ballet for American Ballet Theatre. It is a flurry of diagrams, arrows and numbers, all crucial information about the ballet’s structure, movement and characters.