We don't know her very well
Ling Shi Shi was the only one who stuck gold on her own face. She only knew those two idiots, Eldest Liu and Second Liu, and lied to them to help her vent her anger. " Liu Ru smiled and said, "This matter has nothing to do with our Liu Jing and the Liu Family."
Would she admit it? If he said that he didn't know about Xia Xiaoxi's identity and that Liu Jing hadn't done it on purpose, then who would believe him? You don't know your identity, so you asked someone to force a girl?
If they admitted it, it meant that the eldest young master of the Liu Family, the future heir of the Liu Family, would attack the Xia and Xi Families in public. That meant they would have to face the wrath of the two families.
His daughter's daughter-in-law was almost killed by someone. Whether or not she liked Xia Xiaowang, due to her identity as a Wealthy Class family, she had to take it out on him.