Underworld owner Carla watches her troubled boyfriend return to alcoholism after conceding his son to estranged wife Leanne over the next week.
She told Soaplife: "She fears she's pushed him over the edge. Michelle tries to tell her Peter has brought this on himself, but Carla loves him and she's really scared. She wishes she could turn back time."
Describing Carla's mindset when Peter abducts Simon, King went on: "She would be stuck between trying to make Peter see sense and knowing that he'd go with Simon anyway so it would be better if she went with him.
"All I can say is it would be against the law for them to take Simon, but she'd still do that for Peter.
"She loves Peter, but she feels a bit responsible for all the angst he's going through over his son, and thinks maybe it would be easier if she'd have left him alone."
The 39-year-old also revealed in the interview the reasons behind her four-month break from filming.