Since we only have the title 'the girl from plainville the real story', it's hard to determine who she is exactly. She might be someone well - known within the Plainville community for a particular reason, like an act of kindness or a great achievement. Or she could be a regular girl whose story has been chosen to be told for some deeper significance, perhaps to represent the experiences of many girls in that town.
The identity of the girl in 'the girl from plainville the real story' remains a mystery from just the title. However, she could be a local girl who has had an impact on the town in some way. Maybe she was involved in a community project, or she faced and overcame a personal struggle that is relevant to the values or the history of Plainville. It's also possible that she is a symbol of a certain era or social situation in Plainville that the story aims to explore.
I don't know specifically who the girl is as the title doesn't give much away. She could be an ordinary girl with an extraordinary story from Plainville.