She was especially strong in free skating. In 1972 the changes in judging rules lead to a reduction of the importance of compulsory figures, and this worked to her advantage in winning competitions. Representing East Germany, she became World champion in 1974, three-time European champion between 1973 and 1975, and winner of the bronze medal at the 1976 Winter Olympics.
Until 1973, Errath's chief rival was Sonja Morgenstern, another skater from East Germany who was coached by Jutta Müller. In 1976 she faced another serious rival named Anett Pötzsch, also coached by Jutta Müller. Errath lost the competition to Pötzsch at the 1976 Europeans, winning the bronze medal, but came back to medal at the Olympics and the next Worlds.
Errath was formerly married to Ulrich Trettin, a former East German tennis champion. They have two children, Jenny and Marcus. She remarried in 2006 and is now known as Christine Stüber-Errath.
Christine Errath currently works for the German TV station MDR, which produces programs in the German states of Saxony, Thuringia, and Saxony-Anhalt. She hosts the show "Außenseiter Spitzenreiter" (“Top model Outsider”) with Hans-Joachim Wolfram (creator of the Dynamo Dresden hymn "Dynamo Fever").