Jeff Hanna

Some seasons ago on APTCH, there was a flash-forward to the present day, showing a young blonde woman (played by the same actress who plays Olivia, in a blonde wig) driving up to Ash park and going inside to visit an extremely elderly Sarah. I don't recall exactly what she and Sara talked about - but I believe it involved Sarah's explaining a long-ago incident. I also don't remember how the young woman addressed Sarah, so was not clear about their relationship. Who WAS that young woman - and what were the circumstances of her visit?