Question: When did Sophie Of France (1734–1782)'s mother die?
Sentence (from "Sophie of France (1734–1782)"): "Sophie" Philippine Élisabeth Justine de France, (27 July 1734 – 2 March 1782) was a French princess, a "fille de France"; she was the sixth daughter and eighth child of Louis XV of France and his queen consort Marie Leszczyńska.
Relevant evidence: Yes