Rubuta ci gaba don wannan sakin layi - Kiessling ta lashe lambar farko ta kasa a gasar zakarun Jamus ta Gabas a shekarar 1989. Wannan shekarar ta kasance mafi girma a cikin aikinta. Ta fara ne ta hanyar lashe lambar farko ta farko a gasar zakarun Turai ta 1989, inda ta dauki matsayi na biyu a bayan Doina Melinte na Romania. A watan da ya biyo baya ta yi rikodin mafi kyawun rayuwa a cikin gida na minti 1: 59.68 a gasar zakarun duniya ta 1989 IAAF a cikin gida <unk> wannan ya kawo mata lambar tagulla a matsayin manyan uku duk sun gama cikin rabin dakika, wanda dan uwanta Christine Wachtel da dan tseren Soviet Tatyana Grebenchuk suka doke ta. A cikin lokacin waje ta kafa ƙarin mafi kyawun rayuwa guda uku: minti 1: 59.41 don mita 800, minti 4:04.44 don mita 1500 da minti 8:46.99 don mita 3000. Ta 1500 m mafi kyau, da aka rubuta a Gabashin Berlin, ya kasance ta bakwai a duniya a lokacin wannan kakar. Ta kasance ta huɗu a gasar cin kofin Turai
(1500 m) da kuma 1989 IAAF gasar cin kofin duniya (3000 m).