Had you already looted the vault.
That alone won't make her hostile, but if you rode the elevator to the main floor 'security' got a look at you - so next time back they are looking for you... I once did this, and had to go back and re-loot the vault...
But if you hadn't done that, it could be some other glitch...
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Tom /Celeron 2Gz/P4 3Gz/AMD 64 3000
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