The woman was paid between 2.50 and 5 euro an hour – plus board – for between 30 and 60 hours a week.
She took a case to the Workplace Relations Commission which ruled the family breached several employment laws.
It ordered that she should be compensated for money owed for work, rest, annual leave and public holidays which the family accepted.
The woman issued a statement saying she hoped that au pairs will no longer be exploited as cheap labour.
Edel McGinley from the Migrants Rights Centre says the ruling makes it crystal clear that au pairs have to be treated as employees.
