This is not genuine religious piety. This is making herself pathetic so that you'll comfort her. Don't do it. Ask her what she is offering God to make up for her failings . . . like volunteering at the local hospital. Suggest she go spend some time in prayer so that she can feel the solace of God's mercy and forgiveness. Give her back as much religion as she gives you. Then tell her that she has inspired you to want to spend some time in prayer and that's what you are getting off the phone to do. Assure her you'll pray for her.

She is all about manipulation. Don't reward that behavior by staying as an audience to her performance.