There are two places in France called Solesmes (Solesmes, Nord and Solesmes, Sarthe), and the source does not say which. Neither place is a primary topic in French Wikipedia. The place in Nord may be the more likely: it was the birthplace of Paris-based painter Henry-Eugène Delacroix [fr] (1845-1930), whom she may have known; and between 1907 and 1914, it was the terminus of the D'Avesnes-sur-Helpe - Solesmes railway line [fr], and therefore more easily accessible than the place in Sarthe.
