When Victoire was young, she tried to run away from home, only to be caught by Mathilde.
When the two women were older, they parted ways. Mathilde stayed at the family home to make cheese the hands-on way, while Victoire went to Paris and used science and chemicals. Some of Victoire's cultures were stolen, and the Seventh Doctor and Inspector Toprak visited Mathilde to see if she had stolen them. (PROSE: Culture War)