I read the first few chapters of this book around late 2014 to early 2015. I found it during my senior year in my English teacher's personal book collection for our class. I distinctly remember the cover being lines of gray paper dolls with one being bright orange to represent the protagonist. I don't recall the title but I believe it had the word 'number' in it.
It was about a young girl, around 12 to 13 I believe, who lived in a factory with a bunch of other girls who are all marked with numbers to identify them. The only way they can improve their lives is to suck up to the older girls and staff to hope for a fraction of a power. However, the girls that do this are often then mean and cruel to the younger ones.
The protagonist, through a series of events I can't quite recall, escapes the factory and makes it to a nearby city.
The last part I recall before I stopped reading, she's standing in the town square, amazed by the city; then I subsequently graduated so I never finished the book. I've been curious about what happened after I stopped reading for a long time but numerous Google searches have been ineffective.