According to the Daily Star, Sally - played by 44-year-old Siân Reeves - continues in her attempts to become Laurel (Charlotte Bellamy) and re-establish herself in Ashley Thomas's (John Middleton) life.
Over the last few weeks, Laurel and Ashley have been forced to deal with Sally's over-bearing nature and underhand attempts to rekindle her teen romance with Ashley.
Events, however, takes a shock twist when Sally sets the church alight knowing that Laurel is trapped inside. The fire and ensuing carnage are claimed to be some of the soap's best scenes of the year.
An Emmerdale insider told the newspaper: "What most viewers won't know is that Charlotte Bellamy was heavily pregnant when we filmed the scenes.
"She was crawling across the floor with six foot flames burning around her all the while trying to hide her baby bump."
They added: "Charlotte didn't let anything get in her way and the scenes look absolutely amazing."
The scenes are due to air in mid-November.