It's interesting, though, that her smell has been increasing even as her death wish has been making it worse. Are these two sides entirely unrelated, or would it disappear if she ever truly feels like living again, thereby also removing the reason Shiori wants to eat her?
If Hinako's enticing blood was just the result of suicidal depression, I would think a monster would recognize that, and realize giving Hinako a reaason to live, would spoil the meal. Unless you're suggesting, Shiori's ultimate motive is actually something other than eating Hinako.
I mean, the two are most likely unrelated, but as we just learned, the monsters here don't know what changed in her to cause her to develop that tasty smell either. Shiori specifically recognizes the additional rot of the death wish, but it would be quite a stretch for her to assume the two smells are related in any way, especially if it's normal for a person with the enticing smell to have it from birth. I have no doubts that Shiori's quite genuinely exactly what she says, especially since we've had glimpses into her thoughts as well, not just relying on her words.
But now that I think about it some more... No matter whether the two are related, the mere fact that her smell is something she acquired only after the accident shows that it may also be possible for her to lose it again. Maybe a goal for Miko to work towards - if she can find out what caused this change and how to reverse it before Shiori decides to eat Hinako, Hinako would be saved and Shiori would get to eat her in a different sense.