Victoria McKay and the Kingdom of Creatures

Victoria McKay had the perfect family: a doting mother, a distracted father, and a perfectly adorable daughter, Vicky. Why did Mum and Dad have to ruin everything by having another baby?
Vicky tried to get along with her younger sister Ashley, but after seven years of insufferable pranks and moaning, she'd reached her limit. When, in a fit of rage, Vicky shouted that she wished Ashley would disappear, she'd fully expected to be sent to bed without supper. She hadn't expected to wake up the following morning to find that Ashley no longer existed.
Only then did Vicky remember the peculiar furball creature she'd met in the hospital corridor all those years ago on the day Ashley was born - the creature who'd given Vicky a magic wish - which she'd accidentally used the night before. Confronted with the horrors of being an only child, Vicky embarks on a race across the country to the mysterious Black Wood of Rannoch. There, with the help of Emma the Cardenere, Vicky descends into a hidden realm of magic, monsters, and adventure on a mission to restore her not-so-perfect family.