More to Petunia than what we see

[amanitamuscaria1]

No: HPFGUIDX 156475

I've been considering this bit from JKR's Radio City show.
She's stated before that neither Petunia nor Dudley will do magic, on 
her website.
Petunia obviously knows more about the wizarding world than she lets on.
'That awful boy..' statement, which we've argued for James or Severus, 
staying over one holiday.
What if the answer is that one of the times James and Lily defied Lord 
Voldemort was on an attack on Lily's family? Their parents didn't 
survive, but Petunia and Lily did, so Petunia has first-hand knowledge 
of what LV and Death Eaters are?
'That awful boy' may very well be Snape, but in an ambiguous role, 
where he is faced with what being a DE means, and _this_ is where he 
changes sides?
If his change of heart comes about after LV acts on The Prophecy, it's 
too late. We then get into the - did he hear all the prophecy and only 
tell the first part or did he only hear the first part, and all the 
problems that involves.
But if he's already DD's man by the time of telling The Prophecy, we 
don't have all this difficulty. All the Hog's Head business is eyewash.
Cheers, AmanitaMuscaria