After becoming lost in the Everfree forest, Fluttershy must face survival situations she never thought she would encounter. eventually, her friends learn of her disappearance and start a search to find her. When she is eventually found, she returns a changed mare.

Inspired by Ezhik's idea in the Rejected pony fic ideas archive
http://rejectedfanficideas.tumblr.com/post/27505817085/rejected-pony-fic-idea-195-fluttershy-goes