I have just found this thread, after having posted on another about the child of Margaret Kennedy and Andrew McDouall. Margaret Kennedy was my great great aunt.
The following information is taken from my family tree, and information from a document prepared for a Petition for service of heir of provision and transfer of lands in the waterhead and others by John Cathcart Christie, 1916.
Helen was born on 21st January, 1794. She married in 1829 to Louis F. Chaumont, in Avocat, Paris. Louis was a teacher in Edinburgh, and later they moved to England. They had 4 children, 1. Eugene Achille Theodore, b. 8 October 1828, 2. Francis, m. Ellenora T. Gray and had issue, 3. Alexander, 4. Anna Kennedy, b. 8 October 1834, unmarried. The family are listed in Scotland Census records.
Helen died on 17 March 1875 in Hampshire, England.