I found an intriguing reference to Princess Paskevitch in Little Mother of Russia.
"The Princess, whose husband disapproved of Alexander II's liaison with Catherine Dolgoruky, had closed her doors to the Romanovs with the exceptioin of Dagmar. No other member of the Imperial family ever crossed the threshold of her large house on the Quai. When the revolution came, the Princess, eighty-one years old and almost blind, refused to leave the capital."
What happend to the Princess? The first time I read this book I was a hundred miles from civilization and I swore that I would remember to ask this question, and I remebered!