Petunia's friend Yvonne - why was she mentioned in Bk1

[lily_paige_delaney]

No: HPFGUIDX 85016

With all the chat about Mark Evans and Blaise Zabini being mentioned 
by JKR for a reason it suddenly occured to me that in Book 1 when 
Mrs Figg breaks her leg the only two people Vernon mentions as 
replacement babysitters are Marge and "what's her name, your friend 
Yvonne"

Petunia tells him not to be silly - Marge hates the boy but she 
snaps that Yvonne is on holiday in Majorca.  Why was she so snippy 
about Yvonne?  Could Yvonne be a childhood friend of hers and/or 
Lily's?  She must know about Harry to be considered a possibility.

More questions and no answers!  Come on book 6!

LPD