1790 Sophie Creutz - Black

Sophie Creutz was born in 1752. She was married in 1772 with his distant relative, officer Lars Reinhold Glansenstierna. The young lady's life was peaceful at first but apparently she was at least somewhat aware of her husband plans, as she was in close correspondence with Georg Magnus Sprengtporten.
The rest of the story, You may read in the book with name: 

"Sophie Creutz och hennes tid. Adelsliv i 1700-talets Finland."