Hi,
My girl finished reading the following 21 books which are all her favorite. Many of them are popular titles in the girl's list. I believe that your girls at upper primary school age will love reading these books as well. They are for sale at HKD 320. All are in good condition (not broken) with a few a bit dated.
Trade at Lam Tin or Kwun Tong MTR station. Please pm me if interested.