So, after the BBEG goes down
Spoiler:
.
she rises as a Daughter of Urgathoa almost immediately
Question is, what about
Spoiler:
her magic stuffies? Personally, I see no reason why she should lose the benefits of her cloak of resistance, her headband, or the like...
I agree. I don't have the stat blocks handy, but if you do the math it should indicate if they were included in the builds.
But yes, on Friday when my PC's hit this she will indeed have the value added of her "stuffsies".