On 20 February the next year Arendt helped set a world indoor record of 1:32.55 minutes in the 4 x 200 metres relay, with Silke Knoll, Mechthild Kluth and Gisela Kinzel of the sports club SC Eintracht Hamm.

At the 1988 European Indoor Championships she won a silver medal in the 400 metres, placing between East Germans Petra Müller and Dagmar Neubauer.

[5] At the 1988 Olympic Games she finished seventh in the 400 metres[6] and fourth in the 4 × 400 m relay, with Ute Thimm, Andrea Thomas and Gudrun Abt.

[7] At the 1990 European Championships, however, Arendt was again knocked out before the final round of the 400 metres competition, only reaching the semi-final.

[8] She finished fourth in the 4 x 400 metres relay with teammates Karin Janke, Andrea Thomas and Silke Knoll.