Yesterday (November 4), it was announced that Steph will be heading back to Ramsay Street in 2013, with Bonner expected to start filming again from January.
Bonner left Neighbours in 2010 after 11 years playing the role. Steph's exit storyline saw her sent to prison after knocking down Ringo Brown on her motorbike while driving dangerously.
Bonner told TV Week of Steph's return: "We always knew when I left they would revisit her. When they contacted me and said it was time, there was no question of if I wanted to do it - of course I did!
"Steph's a bit damaged because she's been through a rough time being in prison and obviously she's lost custody of her son Charlie. It's really sad what's happened to her."
Bonner confirmed that Steph is returning to Erinsborough with a "score to settle" - likely to be with Paul Robinson (Stefan Dennis) after he sparked her downfall two years ago.
The actress also said that she would not rule out a reunion for Steph and old flame Lucas Fitzgerald (Scott Major).
She explained: "When she went inside, she left Lucas and clearly expressed to him she wanted him to move on. But I just don't know if she believes he has when she gets out. She may be looking for some comfort and familiarity."
Neighbours airs weekdays at 1.45pm and 5.30pm on Channel 5 in the UK, and weekdays at 6.30pm on Eleven in Australia.