She is alleged by German authorities to have stolen 130 million Euro (240 million incl interest as of 2012) from East German accounts in the 90s that belonged to Germany after the reunification, legal action is ongoing. In 1973 she nevertheless became chief executive, in 1978 trustee of the controversial foreign trade company Novum GmbH, by German accounts an affiliate of East German Alexander Schalck-Golodkowski"s Kommerzielle Koordinierung, while Austrian Communists maintained for the longest time it belongs to their local party. Steindling was also involved with the similar trading company "Transcarbon".
She also had considerable income by representing Western companies like Bosch, Ciba-Geigy, Voestalpine and Steyr-Daimler-Puch in East Germany.
In the early 90s after the German unification there were 250 million € on Novum accounts, about 100 million of which could be easily seized by German authorities in Switzerland. In 1991 Steindling transferred the Austrian Novum balance from a Länderbank (from 1991 onwards called Bank Austria) account to one of the BFZ, a Swiss "Bank Austria" affiliate and then back to other Austrian accounts, according to Profil (see article below) likely abetted by Chief executive officers René Alfons Haiden and his successor Gerhard Randa.
She proceeded to go to the bank not fewer than 51 times and drew it all out in suitcases in 1992. In 2003 a German court decided that the money belongs to Germany.
In 2010 a Swiss court ruled that the Bank Austria must pay 120 million Euro but a higher level of jurisdiction ruled there were procedural errors.
Her daughter inherited several pieces of valuable real estate including a Döbling villa worth 15mio € in 1994.