Her mother is a fairy, but not by birth. Her DNA was transmutated by her sister, Moira, who is a professional scientist slash freelance witch slash crazy persona. And because Ambrosia was born a fairy it means Moira’s experiment is a 100% success because the fairy gene can be inherited. Good for her!
Ambrosia is a very sweet and cute and adorable child, but she is mischievous just like any other fairy. And of course because she just started her fairy life, her tricks often turn against her. But we all know that practice makes perfect. So you have to practice little Ambrosia. You have to practice a lot - to be a pain in the neck.