Her uncle, Michel de Marillac, was a major figure in the court of Queen Marie de' Medici and, though Louise was not a member of the Queen’s court, she lived and worked among the French aristocracy.
O seu tío, Michel de Marillac (1560-1632), era unha figura importante na corte da raíña María de Medici e aínda que Luísa non era membro da corte, viviu e traballou entre a aristocracia francesa.