She won the 800 metres race at the 1968 European Indoor Games, and the same year she competed at the 1968 Summer Olympics without reaching the final. She then won the 1971 European Championships, in a new 1500 metres world record of 4:09.6 minutes. At the 1972 Summer Olympics Krebs finished fourth. Her world record had been broken in July 1972, by Lyudmila Bragina with 4:06.9 minutes. She won the silver medal at the 1974 European Indoor Championships.
In domestic competitions, she represented the sports club SC Dynamo Berlin. She became East German 800 metres champion in 1968. and indoor champion in 1966 and 1968. In the 1500 metres she became East German indoor champion in 1971 and 1974.
In 1972 she married long-distance runner Joachim Krebs. They had a daughter Nadja who became a runner as well.
- Women's 1500m. World Record Progression
- East German championships, women's 800 metres - Sport-Komplett
- East German indoor championships, women's 800 metres - Sport-Komplett
- East German indoor championships, women's 1500 metres - Sport-Komplett
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