The list author says: "This is a list of short chapter books my daughter loves. For easier chapter books see "Chapter books for a 5 year old girl". If you want longer chapter books but with stories still appropriate for a 6 year old girl, see "Books my 7 year old girl enjoyed reading.""
"There are several more in this series: "Sophie's Tom", "Sophie Hits Six", "Sophie in the Saddle", "Sophie is Seven", and "Sophie's Lucky". My daughter has not read all of them yet but she really likes the ones she has read."
"The best ones are the classic ones: The MSB Explores the Senses, The MSB Inside the Human Body, The MSB and the Electric Field Trip, The MSB Inside A Hurricane, The MSB On The Ocean Floor,... Stay away from the shorter versions."
"Leonora and Arthur Hornblow have several books in this series: Reptiles Do the Strangest Things, Fish Do the Strangest Things, ...Insects,....Animals,...Prehistoric Monsters,...Birds. They are good and my daughter loves them."