In 1626 she left The Netherlands with her mother and sisters to live in Geneva. In 1629 a marriage was arranged for her with a Markgrave of Baden; however, on the night before the marriage she 
eloped with a colonel in the service of this Markgrave, married and produced six children. 

Unfortunately her husband Jean Theodore Croll proved an irresponsible adventurer and so they separated. Meanwhile, in 1630 after her mother's death, her sisters returned to The Netherlands so 
that, after her separation, Maria Belgica was left alone with her children when she chose to remain in Switzerland. 
In 1643 her husband was murdered in Venice and Maria Belgica died in Geneva on 28 July 1647. Because of the scandal she had caused with her elopement, her sisters remained unmarried with the exception of Eleonora Mauritia who, at the age of thirty-six, married a cousin.
 

Source: Leo van de Pas