I've killed her a handful of times, but cant remember how or why. Most games against this banshee end in me quitting after 10-20 rounds.

If she revives, she is immune to negative effects, and every time she goes to 1HP, suddenly fully heals.
I've tried to perfect death her, or passive dissable, or perfect corruption to avoid her gaining golden buff... before reviving, but she cleanses often (specially if equipped with artifact talisman). Once alive again, is she immortal??

Any idea besides getting an stroke of luck from LAD and turn her into apparition??