Friends Death

I just want to pray for my sister who is deeply struggling with a very close friends death. He was not saved and she is struggling with the fact that she kept waiting to witness to him and now never did. She thinks she is the one who should have gone and not the non believer. I keep praying that God will open her eyes and heart and show her the reason why she is still here and the impact she can have on so many more lives that need Christ.