Vanessa has been tipped for heartbreak in the months ahead as show bosses have confirmed that Max will soon embark on an affair with his ex-wife Tanya, played by Jo Joyner.
Max's (Jake Wood) betrayal is likely to shock Vanessa as the couple start making wedding plans in next week's episodes, which she hopes is a turning point for their relationship.
Pondering the pair's rocky future, Lucker told All About Soap: "If it came to it, she'd definitely fight to keep him!"
However, asked whether Vanessa will want revenge when she discovers that Max has cheated, the actress replied: "We haven't seen that side to Vanessa, but I think she's pretty tough and if pushed, who knows how far she'd actually go?"
Lucker is leaving EastEnders later this year but is currently keeping tight-lipped over Vanessa's exit storyline.
"I couldn't possibly say [what it is] as it's much too early to reveal anything, but it will be exciting stuff," she promised. "Vanessa is trying hard to make Max realise that she is the right woman for him. What lengths will she go to in order to keep her man?"
EastEnders' executive producer Bryan Kirkwood recently teased that "people had better duck for cover when Vanessa finds out that she's been betrayed again".
> EastEnders Q&A: Jake Wood on Max's engagement
> Read our EastEnders spoilers and news
Watch a behind-the-scenes EastEnders video starring Zöe Lucker below: