The author thinks that anyone who has read St Clares might be thrown by the fact that the books where written in and set in the 40s - so she feels the need to lets say, modern up the feel of this abysmal ghost write. The girls don't play Lacrosse anymore, no no, they now play Netball - because anyone who has read or is going to read the other books in the series may be confused by this. The characters where unbelieveably one sided and one dimensional and on a purely personal level as someone who can't stand Pat & Isabelle anyway - it made my toes and hair curl just to read the constant slush about what wonderful head girls they made. The use of modern language didnt help and I half expected to read, "What are you going to do if they get up in your grill?"
Cashing in at the worst level.