French school, follower of Jean-Baptiste Lemoyne (1704-1778): Portrait bust of a noble lady, white marble, 19th C.

H 86 cm

Most probably Geneviève-Françoise Randon de Malboissière, also known as Laurette de Malboissière (21 December 1746 – 22 August 1766), a French-born poet, playwright, correspondent and multi-language translator (link).