Underage Magic (was: Petunia is a *Squib*)

[celyse218]

No: HPFGUIDX 58750

After reading about theories that Petunia was a Squib, I noticed an 
interesting contradiction..
Emily F. quoted:

> From [SS] Chapter 4, "The Keeper of the Keys": "Knew! Of course we 
knew!  How could you not be, my dratted sister being what she was?  
Oh, she got a letter just like that and disappeared off to that - 
that school - and came home every vacation with her pockets full of 
frog spawn, turning teacups into rats.  I was the only one who saw 
her for what she was - a freak!  But for my mother and father, oh no, 
it was Lily this and Lily that, they were proud of having a witch in 
the family!"
> 

But if Lily was "turning teacups into rats", she would be violating 
the Decree for the Reasonable Restriction of Underage Sorcery, by 
doing magic outside of Hogwarts (CoS ch 2). So either she didn't 
really do any magic and Petunia was just making that up, or Lily 
somehow got away with it?  Any thoughts?  Thanks all and sorry if 
this has been dealt with earlier, I'm still quite the newbie! : )

Celyse