Original: When she was caught taking a book before her mother read it, Olga would jokingly tell her mother that Alexandra must wait to read the novel until Olga had determined whether it was an appropriate book for her to read.
Simplified: Olga also liked choosing books from what her mother read. When she was found reading a book before her mother had read it, Olga joked that her mother must wait until Olga had made sure that it was a proper book for her to read.