Why did Ginevra petrify Mrs. Norris anyway?

[vmonte]

No: HPFGUIDX 98902

vmonte:

All this talk about Ginevra has got me thinking.  Why did she petrify 
Mrs. Norris in CoS? (I'm sure this was discussed before but I began 
to have suicidal thoughts while using yahoo's search engine.) Did the 
cat just happen to be at the wrong place at the wrong time?  And why 
not just leave the cat on the floor; why hang it by it's tail? Is it 
possible that Ginny is an animagus, but doesn't yet know it? Could 
she have been walking the corridors (in a trance-like state) as a cat 
and bumped into Mrs. Norris?  Did she discover something about her 
while she was in cat form? 

Hanging the cat upside down seems rather personal doesn't it? 
Especially considering that Ginny usually likes animals.  

I do have to admit though that that cat is annoying...

By the way, I don't see Harry and Hermione as an item.  Harry and 
Ginny make a better match IMO.

vmonte