For all the faults this family has, I don't personally think the children accessing literature aimed at slightly older children is one of them.
These kids have been deprived of books, well the older ones, Iddy Biddy superstar extraordinaire has always had them.
I actually find it sad that Izzy has only just started reading books in this way and you can tell it's a new thing by the way she keeps going on and on about it.
I don't think children of Esmes age analyse books in the way we adults do, especially ones who have been living in a book drought for the past 11 years. A lot of it will go straight over her head.