Given that Abigail was talking about possession by the devil right from the start, Vicky should have been more careful, if only to avoid being thought of as "Miss Winters who always sends Abigail into a tizzy...surely we could find somebody more suitable for Sarah...Nathan, do you know if any of the serving girls at the Eagle would be interested in the job?"
Not long before the disastrous end, Vicky got hysterical and said it was all a dream, and tried to wake herself up from it. Perhaps she had that feeling all the way through, so that it seemed it didn't matter what she said - and, in fact, if she started talking about resemblances and future inventions, the 1795 people would turn into the 1967 people and she wouldn't be alone anymore, and a plane would come up to the front door of the Old House and take her to Belem to find Burke.