Right from the beginning, it knew about Jing Huang's relationship with the Dragon Race's crown prince. Its purpose for marrying Jing Huang was to break up the couple and make them kill each other.
This plan was too sinister.
This also explained why it created a replica world to imprison Yu Huang a few years ago at the risk of its scheme being exposed.
This was because it was afraid that Yu Huang would find out the truth and become the greatest stumbling block in its revival plan.
"If it's so afraid of Jing Lan, why did it agree to Sheng Xiao's request after Jing Huang's soul dissipated?" Wasn't it digging its own grave by doing so?