User blog comment:Jopjopjop/Volume 19 Quotes / Spoilers/@comment-101.175.204.97-20141104093453/@comment-24468758-20141104184007

Regarding the peerage issue B214 is right.

"As I prepared a stance, what appeared before me -- was a very cute, short girl in a priestess outfit.

"...A girl?"

Her blonde hair shining, both her irises were also golden coloured. She looks to be the age of a young primary school student." Vol 9, Life 2, Part 3

This just indicates that she looks like an elementary school student, but so does Koneko who is a highschool student, so she could very well be old enough to be in her last year of middle school. I just wanted to point this out, but I do think she is quite young based on her childish behavior in the later parts of Vol 9.