Though Han Mei wasn't injured after fighting Zhao Ling'er, she was still dead tired. So, Lin Xi was sure that she wouldn't be making any moves in the near future.
On the other hand, Zhao Ling'er had been sealed inside a painting and sealed along with her were all her worries at the moment.
Half her worries were busy sleeping and half had been sealed inside the painting giving her time for herself. So she went back to her room as she had nothing else that she could do at that time. She was powerless to go against Han Mei, especially after she witnessed what happened to Zhao Ling'er.
As soon as the fighting noises dwindled down, the hidden Zhang Jian came out once again in high spirits as if he didn't even know what had happened.