Neppach was born into a
Jewish family in
Frankfurt am Main in 1898. She began playing tennis in her early youth and won her first title in 1910, aged 12. After World War I, Neppach married film architect and producer
Robert Neppach and moved to Berlin, where she joined the sports club
Tennis Borussia Berlin. In 1924 and 1925, Neppach won the singles title at the German Indoor Championships. In 1925, she reached her greatest success by beating
Ilse Friedleben in the final of the
German Championships at Hamburg in three sets. That year she won eight out of nine possible titles at German championships and was co-ranked No. 1 in Germany with Friedleben. At her only appearance on a
major tournament at the 1927
French Championships, she reached the third round, losing to
Eileen Bennett in three sets. During the following years, Neppach's and
Ilse Friedleben's place at the top of German women's tennis was taken by younger and more successful players like
Cilly Aussem and
Hilde Krahwinkel. In this period, Neppach mainly focused on doubles events, but still ranked ninth nationwide in singles in 1932. ==End of career ==