After 1765 the couple moved to Namur, in the Austrian Netherlands, where they became part of Belgian high society.
Isabelle inherited his fortune but left the Low Countries due to the French invasion, finding refuge first in Bavaria and later in Prussia.
[1] Finally returning to the Low Countries again, on 24 November 1800 she took an oath of loyalty to the Constitution of the French Republic in Liège.
[1] By her will, first drawn up in Fernelmont on 28 April 1788, and modified in 1784 and 1805, Brunelle established four foundations for the poor in Aachen and an almshouse in Namur.
On 15 May 1872 a stone statue of Brunelle, sculpted by Guillaume Geefs, was unveiled in the almshouse garden.