She commented: "I've been so laid-back. And actually, Jamie's sisters - who I'm very close to - have both been going, 'Kym, you do know we've not got long?!' I've got some help as well - organising it with my friends helping me."
Reflecting on the gathering, the 36-year-old said: "We had so many people from Corrie, and some of my old friends from years ago. My mum came, and Jamie's mum. We had such fun. I never really did girlie holidays, because I had my kids so young. I had David and Emily - by the time I was 21, I had both of them."
Discussing the storyline, Marsh explained: "Because there's only ever been Ryan and Michelle, they've always been very, very close. So I think she's really disappointed that suddenly she feels that there's a huge wedge between them, and she can't quite work out why. So all this stuff he's telling her, she's desperate to believe everything that comes from his mouth.
"There's a bit to come, I think. It's not quite over!"
Coronation Street continues tonight (August 3) at 7.30pm and 8.30pm on ITV1.
Watch a preview of tonight's Coronation Street double bill in the video below: