Leng Youchen paused in his steps, suddenly thinking of something, and quickly walked to the third floor. The castle was large, and all four Princesses lived on the third floor. At that time, Windsor lived in the last room at the end of the corridor, so the closest ones to Windsor's room were Daisy and Eden.
At that time, Eden was not in the castle, leaving only Daisy.
During the fight between Wei Anning and Windsor, the commotion was too loud for anyone downstairs to hear, but it didn't mean Daisy couldn't hear it. If Daisy heard it, she could have quietly gone in to kill Windsor when Wei Anning left, and then framed the lady. It would make sense in terms of timing and logic.
During this time, the servants were all downstairs, so it makes sense that no one saw anything.
