I'm not sure specifically who the girl is without more context. It could be a fictional character created for a particular story, perhaps a girl who managed to escape from a difficult situation like a dangerous place or a bad relationship.
I'm not sure which specific 'the girl who escaped' real story you are referring to. There could be many stories with such a title or concept. It might be a story about a girl escaping from a dangerous situation like a kidnapper, or an oppressive environment.
Again, without knowing the specific story, some possible key elements could be the girl's motivation to escape. It might be fear, the need for freedom, or to protect someone else.
Another theme might be courage. It takes a great deal of courage for a girl to escape from whatever situation she was in. Whether it was an unsafe environment or a place where she was being oppressed, she had to be brave enough to take the first step towards freedom.