My husband cheated...?

It has been nearly nine months since I discovered my husbands infedilty. We have been going to counseling once to twice a week to deal with the aftermath. My husband has made a complete change and I sincerely believe he regrets what he has done. We are going to renew our wedding vows to mark a new beginning. While I have found it in my heart to forgive my husband for his betrayal, I cannot fathom forgiving the other woman. I need to let this anger and hostility go for my own sake and sanity. I cannot imagine how I can forgive her, for she knew he was a married man with children and she continued the affair for nearly 6 months and it was he who ultimately ended it. I love my husband and I want to continue our life together, as husband and wife, and as parents to our beautiful children. I am having trouble finding reason to forgive her, the other woman, who willingly placed herself into our marriage. I want to forgive her for my own good. Any suggestions?