Dunno.
I'm hungry... :<
She was introduced and developed in the EoTW arc, but since it's been 10 years, it's also true that her new development has begun just now. Since nothing is known about her in the past 10 years and so...
Perhaps we'll see some spoilers tomorrow, or perhaps the raw already? I wanna see how Machi turns out... I wouldn't mind him to look like Orochimaru, tbh.