I hope someone who knows about this stuff will be along soon to advise.
I would ask their local town hall (“mairie”, contact details easily google-able if you have their postcode and place name), if there is an “Assistante Sociale” she could make an appointment with. In a slightly different situation but still without resources, I know @Shiba was very much helped by.the local Assistante Sociale as to benefits etc.
Do asap as processes can take time. Assuming they’re officially resident and done their yearly tax returns I suspect the answer she’s received will stand but there may be some other benefit she can apply for and the Assistante Sociale is the person to advise and help.