Sara Trumble told a British employment tribunal that she was hired to look after Mills and McCartney's daughter Beatrice, but was relegated to domestic chores after returning from maternity leave in 2008. She also claimed that Mills forced her to work long hours without extra pay.
Tribunal judge Steven Vowles dismissed Trumble's claims for sexual discrimination and unfair dismissal in a ruling Friday.
Mills had denied the claims, saying she had treated 26-year-old Trumble like a daughter. She said the relationship turned sour when she refused to give the nanny money to pay for breast enlargement surgery.
Mills and McCartney married in 2002 and divorced in 2008.
