She is married to Frederic Lievin Alleweireldt.
They got married on September 8, 1892 at Beveren Ijser, Flandre Occidentale, Belgique, she was 48 years old.Source 1
FamilySearch: Family Tree
Nathalie, Rosalie Vandensteendam
Birth 18 June 1844 • Proven, West Flanders, Belgium
Death 4 April 1912 • Beveren-aan-de-IJzer, West Flanders, Belgium
Parents Amand, Edouard Vandensteendam • Jeanne, Therese Lips
Spouse Francois Vanderbrigghe
Lead confidence: 5
https://www.familysearch.org/tree/person/KZPQ-V7G
FamilySearch: Family Tree
Nathalie, Rosalie Vandensteendam
Birth 18 June 1844 • Proven, West Flanders, Belgium
Death 4 April 1912 • Beveren-aan-de-IJzer, West Flanders, Belgium
Spouse Frederic, Lievin Alleweireldt
Lead confidence: 5
https://www.familysearch.org/tree/person/9NTY-B1L