This story is so good, I'm crying.
Poor Titania.
For Raymond, I have a theory, in the first chapters we have seen a few moments in his pov, and it's not like he doesn't like Titania, it's more of "my duty as the future duke is more important" plus all his father had said about the imperial family. So seeing Titania so changed must have been truly a shock. So I still believe he has to grovel for forgiveness, but I wouldn't kick him out as ML for now.
Anyway, Titania's treatment is the most public secret of the empire: everyone knows how she is treated, how isolated she is and yet Empress and second prince turn their eyes on the side (their own position is so precarious that they cannot afford to protect her), her own mother is passively dying in her own castle, even the Duchy knows but still treat her as an enemy.
At one point, it's no wonder she tried to harm herself or is passively suicidal herself, if everybody knows but still do nothing to help her.
It's also very likely that Titania has the power of light, and while it's a bit cliché, I can't wait to see how it's going to be seen.
After all, it's not everyday we see a reincarnation story where the FL is homesick.