This was a novel somewhere on the line between intermediate and YA. It was very funny, probably mostly intended for girls, and vaguely historical - meaning it seemed to be set in some time pre-20th century (UK or Europe, I think), but I doubt it was adhering to any actual history very much.
I encountered it in 2016 as a hard-backed library book, in the hands of a kid who I would guess read at a 13-15-y.o. level. I had the impression that it was the first in a series, but wouldn't swear to it.
I unfortunately only got to read a few pages of it. It was a first-person narrative from the point of view of a girl who was, at least at the start of the book, a lady's maid. She was catastrophically bad at being a servant, mostly through wild, hyperbolic over-confidence. She spilled soup on nobility, all sorts of things like that, and when her employer exploded in rage at her incompetence, she assumed the woman was hysterical and slapped her. She sailed blithely through all the havoc she created, never considering that she might not be expert in everything. Many of her actions were preceded by statements like, "I have the decisiveness of a general - I quickly took command of the situation." There was a lot of "I have the ___ of a ____" in describing her own prowess.
I *thought* that the protagonist's name started with a P. Whatever it was, the title of the book was "Just [Name]."
I'm delighted to discover that this community exists, since I loved WhatWasThatBook on LJ. Any/all help appreciated.
ETA: Found in record time, despite several errors on my part. Thank you,
conuly!