I had two gifted readers in reception, both reading around age 14 although there was very little suitable fiction for them to read. Personally, I really don't see why parents think that learning only happens at school. It doesn't matter what book the teacher gives her, you can easily give her another book at home.
One teacher would not let my son move up until he could read with expression. He was, for him, reading with expression but realistically how well can a reception child read with expression? So he stayed on Level 6 for the whole year and he read each book about 10 times each - great insight that teacher had!
The upside is that we used it as a memory test and he would read the book to me without having the book on him
and I gave him Harry Potter and National Geographic to read.