What could be the reason?

-Yang Household-

"Milady, Milady, did you hear the news?" Xiaowei came running and barged into the chamber of Yang Ning without knocking on the door. 

She was panting heavily and her face turned red from running so much. She was in so much urgency that she forgot to knock on the door before coming inside. 

She came to give the hottest gossip that she heard from the other maids to Yang Ning but halted when she saw Yu Ling in the room as well. 

"Milady….what are you doing?" Xiaowei was surprised to see Yang Ning wearing a heavy dress made of pure silk when it was time for her to go to bed. 

She should be wearing her night clothes by now, why is she wearing her silk dress at the moment? She wondered. 

Not only that, she was carrying the three heaviest books on her head and was holding onto her skirt, as if she was trying to walk in this uncomfortable posture.