I really don't like how the characters reach conclusion in this manga. Maybe that's just me. It's like they just pull off whatever explanation convenient for the plot. When any situation can go all ways.
-edit- rereading the last few chapters, I wonder if by wanting to die, she means the identity of Shinju, specifically. Does she want Shinju to die so she can be her own person with a new name, etc.
Okay I'm caught up on this. I really thought this was a finished manga (it technically is, I mean the scan being finished) and I thought it was a weirdly rushed ending. Imagine my surprise when we're not even halfway through lol.