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.it was years after the main story, they already have a child and while being a queen she's also doing archeological excavations where she'll discover a mirror that can send her back
her daughter felt it's power and was always crying scared that her mom might disappear
Callisto could barely sleep for quite some time because he's terrified to wake up that Penny is gone
one night when the mirror activated, Penny got transported into the other world, at the room where her body was in a coma, her old family will saw her and thought that she's a foreigner that got lost, but then they realized that it was her because she resembles her other body, the old family cried and ask for forgiveness, Penny pulled something from the equipment that's keeping her old body alive (it's in coma) and threw it out of the window, she literally killed herself in there.
after that she started to disappear to comeback to Callisto's world, there's no longer any connection that will pull her back into the old world
then while she's about to return, she met the real Yvonne, i forgot their convo tho >.<

Huh its different from the novel? Cuz based on the spoiler i saw.. i thought that she went back to her world first???