This is such an incredible story. Thank you for sharing. I think if you're brave enough you should somehow let her know you have always been on her side. And though you were terrified that night, you understand why she did what she did. I don't know if the seance was ever finished properly. If you can, find a way to close her time here on earth and finally let her spirit rest. If you can still hear scratching at night, she probably hasn't had the chance to go to the afterlife. She deserves to rest and finally be at peace.