From Fate to Destiny: the Prisoner of Azkaban

Adalyn Potter has been to hell and back over the last 12 years. When Sirius Black escapes from Azkaban and is believed to be targeting her nephew, she is asked to return to Britain. However, while she is now allowed to see her nephew and protect him, this means she has to face her old friends, the wizarding public that turned on her and her past. Eventual Sirius/OC. M for a reason