After this, de Ahna no longer performed in operas, but continued to sing in concerts of Lieder with her husband as pianist. In 1904 they gave one such concert at Carnegie Hall in New York City, and also gave performances at concert halls in Boston, Chicago, Cleveland, Pittsburgh, and Washington D.C.
Subsequently, de Ahna stopped performing on the opera stage but continued to perform solo concerts of Lieder with her husband accompanying her on piano. In 1904, they gave a notable performance at Carnegie Hall in New York City, as well as engagements at concert halls in Boston, Chicago, Cleveland, Pittsburgh, and Washington D.C.