Soon, Gabrielle's child, Hope, released Callisto when she was young in hopes to kill Xena and Gabrielle which only resulted in the death of Hope and Solan, Xena's son. Callisto was, again, trapped in a cave for a whlie until Hope's ashes took mortal form of a demon and she released Callisto. Callisto attempted to kill Hercules' mother but failed. After that, it was on and off a few episodes for Callisto until The Sacrafice where she took part in the death of Hope and Callisto, in turn, was killed by Xena using the Hind's Blood Dagger. At the end of the 4th season, in Ides of March, Callisto returned from Hell to save Caesar from assasination and to insure Xena turning to the way of love which she failed by both and hopefully, returned to her seat in Hell. Callisto, in the new season, was brought back in a battle between hell and heaven. Xena gave up her light and place in heaven to forgive Callisto and in the end, Callisto was happily reunited with her parents and lived her afterlife with the angels in heaven, where I feel, she belonged from the very beginning.
In tribute to Callisto, I found this montage on the top of the page to say farewell.
