Hatto was born in Saint-Amour-Bellevue in Burgundy in 1879, and studied in Lyon and at the Conservatoire de Paris under Victor Warot.
[1] In the New Grove Dictionary of Opera, David Cummings writes of Hatto, "Her powerful voice and commanding stage presence made her a favourite in the dramatic repertory".
Among her mainstream roles listed in that article are Elisabeth in Tannhäuser, Sieglinde in Die Walküre, Marguerite in Faust and Donna Elvira in Don Giovanni.
In less familiar repertoire she played Telaira in Rameau's Castor et Pollux, and Diana in the same composer's Hippolyte et Aricie and the title role in Ernest Reyer's Salammbô.
She created roles in operas by Camille Saint-Saëns (Les barbares, 1901), Xavier Leroux (Astarté, 1901) and Ernest Chausson (Le roi Arthus, 1903).