Don't you think it's possible that Angelique had grander designs on Barnabas right from the beginning? Despite her being a maid, she was able to marry Barnabas, albeit after getting Josette out of the way. In Angelique's way of thinking, all the sacrifices that Barnabas ultimately had to make to marry Angelique were not an unreasonable price to pay for love. The irony of Angelique's curse is that the price others would have to pay to love Barnabas would be greater: death.
From what they wrote, I'm inclined to see Angelique's character as someone who bought everything that Barnabas told her (i.e. the sweet nothings) and invested them with meaning that they did not have.
That's her problem, basically, she can't believe that he didn't mean them. That it was just sex. Part of that is an unwillingness to accept that she was fooled, I'm thinking. A domestic's life in those days was not a happy one. And I'm also thinking that happy people don't turn to witchcraft (in the Hawthorne tradition of it). Barnabas=Barnabas+lady of the manor package (or at least kept mistress). He's her fairy-tale prince, the one who's going to deliver her from a life of drudgery.
Problem is that he's got a bad case of the Sondheim version of Prince Charming (anyone every here "Agony"?)
Luciaphil