pen-ougi replied to your post “x-chick303 replied to your post “Did you ever decide if you wanted...”
Maybe she knew about it but couldn't do anything since it required willpower to overcome and canon!Hisana was guilt-ridden from abandoning Rukia and simply lacked the will to live. Perhaps Unohana talked to Hisana privately but didn't push when Hisana was resigned, her inherent disdain for weak people just letting the civilian woman to choose this unsightly death. :D
It’s plausible that Hisana’s own guilt would weaken her body, but the fact that she died over the course of months implies that she was being steadily poisoned over that time. And if Byakuya knew that his wife was being poisoned, you’d think he’d take precautions-- starting with assigning her well-being to a select few servants he could trust. And while the elders may have disapproved greatly of the marriage, even I don’t think they’re stupid enough to risk Kuchiki Byakuya’s anger. I mean, he’s clan head-- if he even suspected that they had something to do with Hisana’s illness, he could kick them out of the family, take away all their money/property, dishonor them completely, and leave them to rot away in destitution.
Also...no matter how guilty Hisana felt, I don’t think she actually wanted to die? Sure, she may have believed she didn’t deserve to live, but she had two very strong reasons to keep going-- her sister and her husband. And until she found a way to make amends to her sister, I firmly believe that she would have fought for her life.





