Qin Yan couldn't stay in the Xi family anymore. The old lady was completely charmed by her now. She was completely on her side. This was a very bad sign.
If she didn't think of a way to chase her away from the Xi family, Madam Xi was afraid that in the future, she would make use of the Old Madam's liking to cause all sorts of trouble, causing a good family to be in a foul mood and causing the Xi family to no longer have peaceful days.
Most importantly, she had her eyes on Xi Corporation's shares. If she tricked Ah Ting into giving her the shares, the consequences would be dire. So, even if it was to ensure the Xi Corporation's rights and safety, she couldn't leave her in the Xi family.
Regardless of whether the Old Madam and her son understood her or not, she had to get rid of Qin Yan.
Otherwise, keeping her in the Xi family would be akin to leaving a scourge.