A story about one small changeling that was separated from the hive, she was taught to fear the ponies but is there really something to fear?

Even in a the changeling hive there are the few which are good. I am one of those. I decided to run away since I didn't fit in, I never fitted in.

When Twilight enters the everfree forest she stumbles across an alternate world that seems very similar to her own. She has 3 days to save this world and return to her own. Will she be able to do it or will she die trying.