Sentence:  A dedicated <WSD>reversionist</WSD>, she considered Arthur to have been the last British monarch worthy of the crown. She would have re-instituted the maypole and the setting out of bowls of cream for goblins — despite lack of response to a saucer of Carnation Milk she three times thrice had left on the elegant proch of 3 Mather Gardens. 
Meaning of the word marked with <WSD> tags:  One who clings to previous patterns of behavior or thought, rejecting social or cultural change.