The actress, best known as Rovers landlady Liz McDonald, swapped Weatherfield for Walford for a Children In Need sketch.
She told the Mirror: “I loved working with Jessie Wallace, I adore her. It was hard not to get the giggles. We were shooting a piece of history. I felt honoured.”
Asked if she would ever consider joining the cast of EastEnders, she said: “I could not say no. I’d give it a go – just for a while. I’d love to go back and play Kat’s mum.”
Liz is bowing out of Corrie in the new year, but has insisted her character will return.
She said: “I don’t die so Liz will be back. After I handed my notice in I didn’t know if they were going to kill Liz off or not, but they said they would like me to come back. I agonised over leaving because I love Coronation Street. But I want to go on stage and I have exciting plans.”