Fluttershy had never been a confrontational pony, always anxious and uneasy and preferring not to be the center of attention. When she fell from Cloudsdale, she found nature, and a deep love and fondness for it. Fortunately, she learned how to live in it quickly, as thanks in no short part to said quiet personality it was two months before anypony realized she was even missing, and that her parents had been raising a sack of potatoes in her place.
Art (C) MLP:FiM (C) Hasbro/Lauren Faust TF2 (C) Valve