Books with title Weava the Wilful Witch

Not all fairies are sweet and pink . . . some are Little Horrors! Weava is a young witch who is sure she will receive an invite to a school for bad fairies any day—but when she goes to stay with her sister, Merry, things don't turn out the way Weava wants. Merry is living as a normal human and wants Weava to do the same. Can Weava change her sister back to her old witchy self?