Hermione's detailed knowledge of the topography of DD's office - Source?

[Goddlefrood]

No: HPFGUIDX 185479

> zanooda wrote:
> > I can't remember Hermione ever being in DD's office either, 
> > although I'm not 100% sure :-).

Goddlefrood:

Didn't she rummage through his office to find the books on 
Horcruxes, oh sorry, of course she didn't - she summoned the 
books to her #-o

In which case:

> Carol:
 
> It's also possible that the Prefects were summoned there on 
> occasion.

Is quite right and she is an observant girl.