Hi, I'm 14, and I'm also doing the Jo Hawes worksop & NYT! I recently bought a book called 'the methuen book of monologues for young actors' , and it's really good! Some of the monologues however are from plays I don't know so well, and my LAMDA teacher has 'Audition Speeches for 6-16 Year Olds: 50 Audition Pieces for Actors and Actresses ' , you can buy it on amazon here:
http://www.amazon.co.uk/Audition-Speech ... 906&sr=8-2
Hope this helped, best of luck for her auditions, you never know I might see you there haha!
ActingMad26 xx