Anna, thanks, that makes a lot of sense.
Unlike the UK context, it would seem to me that an English aupair would fit a very specific need in France. I understand (perhaps wrongly) that long hours childcare and housekeeping are and frequently provided by 'nounous' (which are not cripplingly expensive in France the way they are in UK). Therefore, I would imagine a family would only go with an untrained limited hours English aupair for her language skills.
For ggirl's dd's benefit, what sort of families fall within the definition of 'French bourgeois families' that treat their domestic employees notoriously badly. I am forcing you to generalise badly of course, but a lot of the subtle cultural nuances would be lost on her dd when it comes to choosing the right family.
How is it that art directors, actresses etc are less likely to mistreat their aupairs?
Also, living space in Paris I assume is at a premium. Would ggirl's dd expect to get her own room? Is the fact that the family already has an existing housekeeper a sign that they do not intend to force ggirl's dd to unfairly double up on long hours domestic duties as well?