The slideshow captures in question:
From the costume it looks as if the character is meant to be a maid.
(http://www.dsboards.com/eventimages/0306ds_5.jpg)
1968: Ep #443 - Millicent is suprised to find a note on the fan
supposedly instructing her to meet Barnabas in the garden at 8.
I love the shot of the Countess with Bradford. Love to see Herself looking so regal!
(http://www.dsboards.com/eventimages/0306ds_7.jpg)
1968: Ep #443 - Natalie realizes it's possible that Angelique could
indeed be the witch..