[2] The marriage was arranged by her mother, and the negotiations was signed at the French court of her uncle, the king of France, in Paris.

In the marriage contract, her future spouse was officially secured the position of heir to Savoy.

Blanche negotiated with her brother-in-law about her dowry until 8 February 1330, when she was secured Bourg, Treffort, Coligny, Jasseron, Trivier, Pont-de-Vesle and Pontdevaux in Bresse;[3] she was also granted a house in Faubourg Saint-Marcel in Paris by the king of France in 1333.

Her daughter Joan questioned the succession and claimed the rights to Savoy from her uncle between 1329 and 1339.

In 1346 and 1347, she used her influence at the court of her nephew, Amadeus VI, to pursue closer alliances with Burgundy to offset the pending sale of the Dauphiné to France.