The book is a MG/YA contemporary fantasy titled "Bad Spelling." It's also the first in a trilogy. I hope that MIU likes this one enough to take the others too. Hm. Maybe I should just ask.
When Katrina spells her bunny familiar into a pool of green goo, it’s the last straw. Kat’s life is already miserable from her classmates’ teasing. Even her mother and aunt think she’s just not trying hard enough. When she finds out her inability to throw a decent spell is the result of a shaman's curse, she sets out on a perilous journey to Siberia to stop him. The stakes are raised when the curse begins to spread to the rest of Galdorheim Island. Saving the witches’ arctic home falls on the shoulders of a witch who can’t even cast a simple spell.