The question who played Tora Ziyal in DS9 in a more interesting question than you think, as she was played by three actresses during the show, have a look at the actresses who portrayed the daughter of Gul Dukat.
Cyia Batten - First Tora Ziyal
Cyia Batten is a Star Trek veteran and played 3 different roles including Tora Ziyal, her other roles are Irina in Star Trek Voyager and Navaar is Star Trek Enterprise.
Tracy Middendorf - Tora Ziyal
Tracy Middendorf was the second actress to play Tora Ziyal, her first episode in the part was "For the Cause", she was also in X-Files, Angel and Millennium.