User blog comment:Nostradeneonnostrade/Neon Nostrade's status/@comment-83.157.222.108-20180309180232/@comment-48285-20180309233354

In the latest chapter, Shizuku asks Chrollo to tell her fortune (using Neon's ability) and Chrollo says he can't because it disappeared from his book some time ago. This implies that she died somehow, but at the moment, it's not a "for sure" thing. However, this bit of dialogue heavily implies that she died:

Chrollo: I don't know when, but at some point it vanished from the book.

Shizuku: Oh? But then that means...

Chrollo: Exactly.

Shizuku: You know, I've been thinking... That book of yours, Boss... It's pretty much like a Death Note, isn't it?

Again, the implication is that she's dead, but since we haven't seen anybody flat out say she died, it's unknown.