"Slytherin" Hermione?

[Bex]

No: HPFGUIDX 112274

DuffyPoo wrote :
>> "Marietta would have been cleared up in a trice by Madam Pomfrey
>> if she'd known what jinx had been used.  "
> 
> Del replies :
> Marietta has had to keep those monstruous pustules for more than 
> 2 full months !! And the worst of it is that it is completely 
> useless anyway, since she doesn't *remember* WHY she is being 
> punished, now that Shacklebolt erased her memory!

Yb thinks:
Well, Marietta doesn't remember any meetings other than that first 
one, when she signed the paper, and she'd probably remember Hermione 
saying "So if you're signing, you're agreeing not to tell Umbridge --
 or anyone else -- what we're up to." Shacklebolt simply "deleted" 
the meeting memories, though we can't be for sure, of course. Plus, 
did Harry ever tell anyone that Marietta's memory was "adjusted?" If 
Hermione knew Marietta didn't know why she had SNEAK written across 
her face, I'm sure she'd feel less justified. Of course, I wouldn't 
doubt someone has refreshed her memory if she needed it.

On a different pitch (same note):
How can you "decide" what memories to erase? "Obliviate" seems to 
take care of everything, even how to write your own name in joined-
up writing, as evidenced by Lockhart, but there must be varying 
degrees of Memory Charms, otherwise Marietta wouldn't have had much 
use for Hogwarts after this little encounter. So to erase 6 months 
of meetings, how would you go about just getting the ones you want?

Any thoughts?

~Yb