It seems like the perfect excuse to cause the character to have amnesia or something similar, the amount of time the author spent on Yu-Juran will probably lead to some form of redemption arc.
I think she was that good of an actress. We know she's really smart and Yotsuha genuinely believed that she was her best friend for a long time, even before she knew about Uichi's situation.
In the same chapter you gave as an example, the reader doesn't see her face in page 9, maybe she was...
After re-reading this chapter, I just realized that the page 11 was supposed to show that she was pregnant (her water broke given the state of her legs).
Harusa was supposed to be the name of her child with Butama. I don't know if the child is alive or she faced a miscarriage and is delusional...
So the true destruction will finally begin. The book will surely sell given all the bad press Karin and Kinjo have received and reputation in Japan is more important than most countries in the world.
She's pretty much done for and there's no way to bounce back from this, it would be too...