After breaking her leg in the middle of the Everfree Forest, Applejack is forced to take shelter with Rainbow Dash in an abandoned cabin in the woods. Historically, this sort of thing has only ever ended well.
Not long after her release back into the general population of Ponyville, Screw Loose vanishes without a trace. During a search of her home one week after she was last seen, a video recording of her apparent final hours is found.