She is arguably most famous for saving the life of her nephew King Charles VI of France, during the disastrous Bal des Ardents (Ball of the Burning Men).

At the age of fifteen, Joan was present at the infamous Bal des Ardents given by Queen Isabeau, wife of the Duke of Berry's nephew King Charles, on 28 January 1393.

During this, the King and five nobles dressed up as wildmen, clad "in costumes of linen cloth sewn onto their bodies and soaked in resinous wax or pitch to hold a covering of frazzled hemp," and proceeded to dance about chained together.

When Charles' brother, Louis of Orléans, accidentally set the other dancers on fire, Joan swathed the King in her skirts, protecting him from the flames and saving his life.

She married Georges de La Trémoille soon after; however, they produced no children, and the counties passed to her cousin, Marie, upon her death in 1424.