How will St. Therese help?

I talked with my Mom about how I was finally able to pray for the other woman last night. She said that maybe that is a grace from St. Therese. St. Therese was always very concerned with the safety of souls....especially those who were most in danger. I do feel it's a grace for me to pray for her. I pray that isn't the only grace St. Therese gives, but even if it is, it isn't a tiny or unimportant one. I don't want to carry hatred in my heart.