 Smisek made her debut for Germany on 13 April 1995 as a substitute for Patricia Brocker, also scoring her first goal in an 8–0 home victory against Poland.She was included in the 1995 FIFA Women's World Cup squad led by manager Gero Bisanz, her first major tournament, where she managed only one appearance, as a replacement for Maren Meinert in the 0–2 final defeat against Norway.Smisek also represented Germany at the 1996 Summer Olympics, but never played once as Germany were eliminated in the group stage.