It's neat to see Josette telling, through Vicky, the tale of her suicide, because the details don't match what in fact happened in the 1795 storyline. On the other hand, if I remember correctly, the spirit speaking through Vicky in today's episode never did say her name, so that it is theoretically possible that it was somebody entirely different. Heaven knows enough women have thrown themselves off of Widows Hill so there would be a wide selection of alternatives. Maybe it was Beth talking, not Josette. Or maybe the spirit was talking about another location altogether. I don't think the name Widows Hill was actually mentioned.
Or else maybe MagnusTrask is right, and Vicky's trip to the past got messed up, and the 1795 storyline that we later see is not the one that Barnabas currently remembers. If that's the case, then something would have to have happened to Barnabas's memory during the later seance.
This is one of the many things I like about Dark Shadows: it's not perfectly thought out. There are no writers manipulating me. I can make of it what I want.
On another note...the Collinwood residents go to a party at the Old House and are served nothing but claret cup. When they get home, do they head for the kitchen, figuring that at this point even Mrs. Johnson's nine-days-old New England Boiled Dinner will taste good? No, they make a bee-line for the liquor cabinet because they just didn't get enough at the Old House.