She should be tougher than she is, her stats are:
24 str
24 dex
20 con
15 int
15 wis
14 cha
Level 25 Vampire
Base AC -1, plus dex modifier = -7 AC
3 attacks per round
base THAC0 of 4, plus str modifier = THAC0 of -2
Base HPs of 102
100% resist to cold and electricity
75% resist to magic
So yeah, she should be a bit tougher...
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"This place will be your tomb."