Once Upon a Curse — E.D. Baker

Many years before Princess Emma's time, an any fairy cast a curse on her ancestor, Princess Hazel. The fairy decreed that Hazel and all her female descendants, upon reaching their sixteenth birthdays, could not touch a flower, or else all their youth, beauty, and kindness would be erased.

Emma has seen it happen -- her grandmother has always been a spiteful witch, and now her favorite aunt, Grassina, has fallen under the spell as well. Though Emma has wonderful new powers as the Green Witch, she has only a week before her own sixteenth birthday, and with it comes the threat of the family curse.

No one before her has been powerful enough to find the fairy responsible, or to reverse the curse, but Emma is determined -- and with the help of Eadric; her favorite bat, Li'l and some ancestors she has only just met, she may be able to outsmart an adversary she
thought she'd left behind long ago.