Zoella is a popular YouTube celebrity for girls of your dd's age. She's recently launched a book club in collaboration with WHSmith. She talks about her chosen titles on her YouTube channel and the details are also on this blog blog.whsmith.co.uk/tag/the-zoella-book-club/ Most title would be appropriate for a mature 11yo, but I'd do a bit of screening first, if I were you.
One series which is very well written and hugely popular with girls at the moment is the Geek Girl series by Holly Smale. The humorous fiction follows the life of Harriet Manners, a nerdy 15-year-old girl who tries out modelling to "reinvent herself". The first book in the series, Geek Girl was the Number 1 debut teen fiction book of 2013 in the UK. It won the 2014 Waterstones' Children's Book Prize in the young adult category. It also received the 2014 Leeds Book Award in the ages 11–14 category.
Perry Jackson and all its spin offs Murder Most Unladylike series Nation by Terry Pratchet Ruby Redfort series Girl of Ink and Stars Philip Pullman His Dark Materials The Clockwork Sparrow Hetton Feather series by Jacqueline Wilson