Olivia Edwards realized the truth: no matter what, Robert Thomson's heart undoubtedly leaned towards Emma Smith! The reason he replaced the bride during the wedding banquet was because he found out that Emma had a child out of wedlock and felt deceived. So he temporarily chose Ella Martin. Now, Emma was pregnant with his son, his own flesh and blood. Who knows what kind of tricks that woman used to please him, but naturally, he went back to Emma Smith!
To make a scene in front of such a man would not bring any benefits. The most she could do was to involve his trusted family members and use the power of public opinion to achieve her goal.
It could be said that Olivia and Robert were thinking along the same lines. Wasn't Robert also considering using public opinion and seeking support from his uncle's family?
