User blog comment:Rafe Adler/"Various & Sundry Villains" Discussion/@comment-31647781-20180202191000/@comment-1031724-20180202204616

She has to recharge each time. As it was her spell, obviously she cast it again after Lucifer killed her the first time. She didn't do it for Ketch again which is why he's looking for her. The spell seems able to revive her no matter what is done with her body, though the more is is mutilated/destroyed, the longer it takes.

The only way to kill Rowena for good is to kill her, let the spell run its course, and then re-kill her before she can cast the spell. It's like voting out someone with a hidden immunity idol on Survivor. Fortunately there doesn't seem to be a need to kill her, let's hope there wasn't an ulterior motive behind breaking the binding spell.