For me in particular, I think the plot is nice though I think it's hard for people who don't struggle like the MC to understand her. We are following her perspective, so given the info she knows from the story that she reincarnated into, one that barely even describes the wife of the duke, she could only know so much. Actions we know the Duke is doing out of kindness can seem insensitive or even dishonest to someone who only knows one view of them, she'll learn, but it's a long road ahead and given that "Og Grace"'s thoughts still reside within her, it will be even harder.
A story that celebrates movements in one's mental decay, moving forward even if it's one step at a time, as a person struggling with this, I adore the message, keep it up.