Final answer:
The reference information provided does not contain details on St. Louise de Marillac's background; additional research is needed for a factual response.
Step-by-step explanation:
The student asked about St. Louise de Marillac's background, which pertains to History. Unfortunately, there is no specific information provided about St. Louise de Marillac in the original text. To respond accurately to the student's inquiry, additional research beyond the provided reference information would be required. It's essential to provide factual historical background when discussing historical figures. Should the student still require assistance with the information on St. Louise de Marillac, it would be best to look for credible historical sources or academic databases that can provide a detailed account of her life and contributions.