You're a human girl, that the Cullen found two years after Renesmee was born. They had taken you in and raised you as one of them, breaking yet another rule of the Volturi. The Volturi went to Forks to check in with them and Renesmee and find you, they planned to make an example of you. However, it was quickly revealed that you are Demetri's soulmate. Meaning, they can not harm you in any way.