Right after returning to the continent, the first thing that Yennefer did was to make several public announcements.
First, about the fake marriage, she spread the truth: that in reality it was just the emperor's plan to capture a demon lord named Raelion.
Of course, this news was going to bring quite a lot of trouble for the emperor, and might even break his relation with several power figures, since he literally used them all as nothing more than baits, putting the lives of all guests in danger.
After the revelation of the fake marriage, she announced that she was going to break her engagement with the emperor, and that it never actually meant anything.
Thirdly, she had severed ties with her family, which was the sole reason why she was tied with so many boundaries, and even had to get engaged to the emperor.
Anyone she ever cared for had already died quite a long time ago, so it no longer mattered; she was just connected to them through the memory of her family.