Scenes airing next week will see the star's character learn that Theo is the person who has been stalking her. Theo confesses to her when he realises that Eve Unwin and Martin Fowler are onto him.
However, the shocking scenes take a further dramatic turn when Stacey's daughter Lily's waters break. Stacey and Jean realise they may have to deliver the baby themselves due to an ambulance delay – all while Theo is still in the house.
Speaking about the scenes, Lacey explained: "Theo decides to celebrate his new job with Stacey and invites himself over for the evening.
"Stacey genuinely thinks nothing of it because she'd already told Theo a couple of weeks ago that she saw him as a friend and she naively believed he feels the same.
"I think for Theo, he's got all of these warped ideas in his head that 'tonight's the night' for him and Stacey but that all crashes down when Eve and Martin see through him and he has to finally tell her the truth. It floors Stacey and things quickly go from bad to worse."
Lacey admitted that "at first [Stacey] just doesn't believe it because she can't imagine him to be capable of doing something like this".
"He's put on such an act in front on her for months and really supported her so he's the last person she would ever suspect," she added. "It's only when Stacey realises how deluded he is about their relationship that she starts to panic as she knows she's in danger."
The star also revealed that Stacey "absolutely" didn't suspect Theo, noting that "if she did, she would have never let him near her family".
"Up until this point, Stacey has relied on Theo and seen him as a friend and almost a protector," she explained.
"He's been tutoring Lily free of charge, and he's been so supportive with Stacey and the stalker situation. That's what makes it so hard for her because she has no idea who this person is that she's let into her and her children's lives for so many months."
EastEnders airs on Mondays - Thursdays at 7.30pm on BBC One. The show also streams on BBC iPlayer.
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