I have a warrior/sorceress, about level 40 or so - all stats well above 100, great armor/sword/etc.
Josephine just keeps going invisible on me and sending the spikes at me - the others did too, but eventually they "got tired" and couldn't stay invisible anymore. But I just died after fighting her for like 15 minutes, during which time she wasn't solid long enough for me to get a hit in on her. I can summon 5 skeltons, the skeleton wall, and a demonic aide (all very high levels) but I don't think they do me much good - and they go invisible too.
I never bothered with the freeze skill, since it sounded like kind of a spoiler - besides, I'm not sure I could hit her anyway. So...what's the deal?