She can't think straight. All the evidence is there that even if the FL is out of the way the Emperor can't stand her. She's not gonna be empress unless the Emperor is possessed by a demon.
Don't worry people Our Su Luxia... or I'd say Our Su Ziyue got the plan on her sleeve to frame this bitch commited murder So that she will completely got blacklisted by Yun Ling (our Emperor) (little spoiler, I'm sorry)
bruh.... there's something wrong with her head