No one else makes any overtures to Opalyn before she's out of the refectory via blue door, and turning left at the end of that hallway does indeed take her to a library. It's warmly lighted with... actually those are obviously fake candles, the flames on them are utterly steady and unchanging, and there's no heat waver above them, though aside from that they look just like regular flames.
"No borrowing privileges until you've done some lightline-charging," says the obvious librarian there, his tone brusque but not unkind. "Unless you're a really surprisingly excellent fuck in a field with a lot of competition."