Eleonore Bourbon (1587-1619) daughter of Henri I Bourbon Condé, wife of William of Nassau
This portrait shows a member of the Bourbon family, Eleonore Bourbon, in an extensively slashed dress with accordion pleat sleeves. Daughter of Henri I Bourbon-Conde, wife of William of Nassau. Her Wikipedia article is here.
Information about date, artist, and location are not known to gogm.