Wait am I reading it right? Kangyi (the madam from the other country) was completely correct, and Yuheng is trying to sow discord within the family cause the other miss just won't believe it?
if her country hadn't colluded with the Third Prince to harm the Ninth Prince (her fiance), she might've backed her up, but because that happened she'll feign ignorance
Yuheng don't be mean to the Bay. It hasn't been born yet and hasn't done anything to you yet. You have time to plan to make it a letter person than the rest of the family.