I'm looking for some recommendations for my 11 year old niece. She's an enthusiastic reader but not too keen on 'old fashioned' books by Noel Streatfeild, Enid Blyton etc. which is a pity as we have tons of those that we kept from our childhood.
She loved the Olivia series, is a big fan of Jacqueline Wilson and, of course, devoured Harry Potter. I'm trying to think of other contemporary children's books she might enjoy and would welcome suggestions.