Shen Lian had stayed at River Deity Temple for one month long. During this time, Chen Jianmei had already left and gone back to the Temple of Killings.
The reason why he went to the River Deity Temple was because, firstly, he wanted to have the aid of divine region's power to guard Ruoxi and secondly, he went there to pay back somebody.
At this moment, in River Deity Temple, Ruoxi already entered the Empress' divine region and absorbing the river basin's spiritual force non-stop. She operated Dream Heart Sutra that the old Daoist had passed to her to transform the part of Fairy Tianmeng's into the butterfly dream.
Therefore, the Synchronized Heart Mantra of Taisu which was part of the divine thoughts that Fairy Tianmeng had sown, penetrated deeply into Ruoxi's self-divine aura. But also because of the Dream Heart Sutra's difficulty to differentiate between self and butterfly, it became a mixture of real and sham.