Gray Lady: I give up

[Amy Z]

No: HPFGUIDX 11787

Okay, I give up, I can't find any reference to the Gray Lady, the 
Ravenclaw ghost who shows up somewhere in PS/SS.  Can someone send me 
a page number?  Scratch that--send a hint--that's more fun.

Amy Z

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Ern jerked the wheel so hard that a whole
farmhouse had to jump aside to avoid the bus.
                 -HP and the Prisoner of Azkaban
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