Prim may have been back to change out of her costume, but Mona had not yet been back to her room and thus was still in her work 'uniform', although she'd abandoned the little jacket. She wasn't wearing any makeup either, because anything more than mascara required her to go to the makeup artists to make it happen, and most nights she couldn't be bothered and it seemed like she would be taking up their time.
"I don't know about that," Mona demurred, shaking her head quickly at the compliment. "Of course, come in, please." She turned around to the shelves behind her and picked up the book before coming out from behind the little counter to give it to Prim. "I'm glad it's found its owner."