Wen Xinya obviously knew that Ning Shuqian was trying to improve the directors' impression of her and let them know that she prioritized the Wen Corporation's interests.
The corporation's interests mattered the most to the shareholders.
She had also tried to sweep their feud under the carpet by calling it a mere misunderstanding. Besides, who would pursue the misdeeds that Ning Shuqian had done to Wen Xinya in the past? They were not the victims, anyway.
If she were to accept Ning Shuqian's apology, Ning Shuqian's plan would work. Not only would the directors be impressed and view her in a different light, but she could also use the matter against Wen Xinya if they were to get into conflict again in the future.