Siska defended her Hungarian 60 m hurdles title in 1979 – she would go undefeated in this competition until 1982. This led to her selection for the 1979 European Athletics Indoor Championships and she was again a semi-finalist at continental level. Outdoors, she was bested by pentathlete Margit Papp in the 100 m hurdles at the Hungarian Championships. She returned to the top of the national scene in 1980 and ran a personal best time of 13.17 seconds, ranking in the top-25 hurdlers that year. Her Olympic debut followed, as she was chosen to compete for Hungary at the 1980 Summer Olympics in Moscow. She did not reach the final, falling in the semi-final and failing to finish the race.