8yr old starting puberty

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Hi,
My eight year old has difficulties socially and learning wise. I have noticed that her breasts are starting to develop and am looking for a book I could read to her to explain the current and upcoming changes of puberty. I am afraid that given her age and the fact she is intellectually probably a couple of years behind her peers, most books would be to complex or overwelming with the amount of information. Has anyone been through this and has an easy to understand and factual book about the upcoming changes?

If you can overlook the bit about shaving legs What's Happening to Ellie?: A book about puberty for girls and young women with autism and related conditions is fairly simple with basic information if books like Usborne’s What’s happening to me are too much. Mencap also recommend this this resource.