Share on Twitter
The four-time W-League championship winner scored two and set up another, while Melina Ayres scored a second-half hat-trick, as Victory claimed a 6-2 win over Brisbane Roar in Sunday's semi-final to reach their first decider since 2014.
Jeff Hopkins' team will now face the winner of Monday's semi-final between Sydney FC and Canberra United in next Sunday's grand final.
De Vanna scored in either half with Ayres's triple and another from Catherine Zimmerman capping a confident performance just days after losing the premiers plate showdown against Sydney FC.
New Zealand international Olivia Chance and Roar captain Tameka Yallop struck for the hosts, who were playing without key Matildas pair Clare Polkinghorne and Emily Gielnik following their departure to Swedish top flight club Vittsjo GIK.