In Leipzig she met the German-Dutch Pianist and Composer Julius Röntgen (1855–1932), her violin teacher's son. The couple married in 1880 in Landskrona and moved to Amsterdam. The marriage ended Amanda's public appearances, but she continued composing, and the couple arranged musical salons and music performances in Europe of Rubinstein, Joachim and Brahms.
Maier performed violin concerts in both Sweden and abroad. She continued to study composition with the conservatory teachers Reinecke and Richter in Leipzig and violin from Engelbert Röntgen, concert master at Gewandhaus Orchestra in the same city. During this time she composed a violin sonata, a piano trio and a violin concerto for orchestra. Her violin concerto was premiered in 1875 with Maier as soloist and received good reviews.
In 1887 Röntgen-Maier became ill with tuberculosis. During her illness, the couple stayed in Nice and Davos. Her final major composition was the piano quartet in E minor on a trip to Norway in 1891. She died in 1894 in Amsterdam, the Netherlands.
