We read it to DD as a bedtime story (we get thro' books at a rate of knots at bedtime in this house!).
DD loved it but as it was full of all the things that she loves - fashion, dressing up, parties, scrummy cakes - she would! She could also really identify with Silver's 'not quite old enough..' issues - she is considerably younger than her older brother and often announces that "it's not fair..." that she's not allowed to do/go to things that he can....
Reading it as a Dad though, I did find it way out of my comfort zone. DW and I try to encourage the children to listen to and read non-gender stereotypical books. This is just so girlie ;-(. It is very much in the same ilk as the Rainbow Fairy series....Slightly formulaic too...
Nevertheless, the main thing was that DD loved it and is looking forward to reading the next one in the series (I do like this idea of including the first chapter of the next book at the back...).
Oh and on a positive note, DD is good at reading but doesn't really like it very much - she has always (and still does) prefer picture books. She is a confident and competent reader but doesn't like the density of text in a lot of paperbacks....This book was good in having shortish chapters, pictures and relatively large text - she didn't find it off-putting...