In deep space 9, a little girl fell into a time vortex. Her parents desperately worked to figure out how to bring her back (her dad was chief engineer) and he succeeded, but she was a young woman when she came back, and she was wild - having lived alone in this barren planet for so many of her years.
Finally it turns out that she can't deal with living on deep space 9, and she wants desperately to go 'home' (the planet)
with heavy heart they go back to the planet with her and say good bye, letting her return through the vortex - out of their lives forever
And she goes back, and finds herself as a little girl, injured, cowering and terrified - recently forced into this time.
She pushes the little girl into the vortex from which she just came, causing herself to return to her parents as a little girl and then she herself vanishes.
