She arrived with Henrietta Maria on her return post Restoration. She may have been planted in the entourage to become royal mistress and pass on pillow talk to le Roi Soleil. I'm not sure what would have happened if Eva Braun had been on the Allied payroll in World War II, but Louise was an espionage risk for Charles II. She became Duchess of Portsmouth that happens to be a major base for the Royal Navy (dating to 1212). This sporty French import was sent packing when Charles II died. Her Wikipedia article is here.