Seth is scooping out another piece of pie from the pie plate, but stops when Jessica chides him. The next shot shows the piece on his plate.
The girl indicates she is the sole heir of the murderess in the thirty year old case. But earlier she had specified she was adopted, and the adoption process is supposed to sever all legal ties to a child's birth family, so she could never inherit the mother's estate legally.
Funny that Jessica could rattle off the full names of all four protagonists of an (albeit local but) 30-years-old murder case (the victim's, his fiancee's AND their two cousins'). Her conversation the night before with a budding writer now dredging up the story had barely touched on any specifics.