I think she is new to dealing with politics and conspiracies, and so she is taking the approach of "question everything". Combine that with lingering feelings from when he aggressively tried to buy the ring, and it's no wonder she's suspicious of his motives.
ch 358 Chapter 358: Battle of Wits!
Fantasy · godadi
My bet is that a water clone of Xue was caught by the girl. When Jian smacks the clone's face, it's gonna explode in her face.
ch 365 Chapter 365: Connection Between Martial Arts and Qi!
Reincarnated As a Fox With System
Fantasy · godadi