Next week's episodes see the actress's character Sinead meet up with her real mum Morag, who soon discloses some surprising news about why she chose to leave her children years earlier.
In an interview with Inside Soap, Davis explained: "It's something to do with Finn and what happened around the time he was born.
"Sinead's sent reeling when Morag tells her what went on then - she isn't expecting it at all. Her mum's definitely had a bit of a hard time."
Discussing what happens next, the actress continued: "Morag basically says, 'I've not come back for Finn - I've come back for you'. She wants Sinead to live with her in New York - so the big question is whether she'll go off or stay with her stepmum Diane. But I can't see Sinead going anywhere without Finn."
Details of Morag's revelation and why she does not want Finn to live with her are being kept under wraps until transmission.
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