Forgiveness is complicated

I have been working on forgiving someone. It's not going so well. How do you forgive somebody who crushed your world in a way that it can not be fixed who is also NOT SORRY ! That's the part that is driving me crazy . I KNOW I should be a good person & forgive her for my own sanity . I believe people should get second chances. This time though i'm just struggling with it . How do you forgive a person who is still hurting others on a daily basis ? I'm so hurt & angry. Im livid . My heart is breaking for the people this woman is hurting. They cry . I cry . It seems to be a never ending cycle somedays .I want to forgive her so that my anger doesn't just build. She isn't worth the energy i'm wasting . I just don't know how . I have struggled with this for over a year and even more so recently. I believe karma will eventually get you. That you pay for intentionally hurting others.Yet, I don't want her to pay. Just to stop hurting people. My faith feels so tested right now . I wonder why it is being tested ? What am I suppose to be learning here. My mom says patience is a virtue . That there is always a bigger picture with God . So, I pray that God gives my family the strength to get through this and that he will get this person the help she needs. That he will help me forgive her . Miracles happen everyday so I can't give up that God has one in store for us. Real faith is still believing even when it seems there is no way !