Shes a what?!? ; Backstory

In this world, you are either born a Angel or devil nobody can choose this, and your stuck with your form your whole life, but what happens when a girl named Madelyn Rose is born with the form of an Angel and devil?
(Sorry I suck at this)

This is basically my personality irl because I have a very spilt personality of being mean and nice and this idea just popped into my head so I'm writing about it. I only sometimes proofread my work so if there are any mistakes please tell me. Constructive criticism is welcomed.