Letty groaned as the alarm clock sounded. a textbook was still open next to her on the bed. with eyes half-open, she dressed in her waitressing uniform. early customers didn't normally tip very well, but the diner was the only place she could get in a quick shift before classes started. at least she'd be off her feet for a while at school before she had to go to her evening job at the factory. it was all letty could do to stay awake after four hours there to study a bit before bed. then she'd be up to do it all again the next day. what is the best inference you can make about letty?