"her favourite opera by Cherubini"
Cherubini by Ingres
Public DomainCherubini by Ingres

 Beethoven regarded Luigi Cherubini (1760-1842) as an important contemporary composer, although he is not nearly as well known today. Born in Italy, Cherubini spent most of his life in France, where he composed a quantity of operas such as Les deux journées, Démophon and Médée, as well as Church masses, requiems and some chamber music. His connections with the French aristocracy caused him some trouble after the French Revolution, and he was forced into hiding; appreciation for his music briefly suffered as a result of his political unpopularity, but when the monarchy was restored he came into favour again, attracting international acclaim for his compositions.

Listen to Médée by Cherubini on Spotify