Darkness should still be helpful to some extent. Not as good as pre-1.2.0 obviously, but at least she can't see in the dark, so you can expect less attacks coming your way. Then set up some wand of poison bouncing maybe? Good luck!
Btw what item were you trying to steal? I usually never bother...
gremlin - karmic lizard, dark orc, acid vortex, staring eye - dragon turtle, fairy dragon, ogre lord, minotaur emperor - pit viper, orc butcher - greater mimic, dark elven wizard, carrion crawler, dwarven child - imp - ochre jelly, dark elven archer, king cobra, goodwife - kobold shaman, magebane eye, floating eye, quickling king - giant centipede, hill orc sergeant, mimic hivemind, greater claw bug, brown bear, large gnoll - giant bee queen, giant ant warrior, shadow centipede, kobold