She is keeping a beady eye on the filming, which she loves, and just to make her day complete, she is back on her old stamping ground.
When we catch up Sally is in Hebden Bridge with a film crew from Red productions, set up in 1998 to work with writers on modern, innovative and entertaining dramas, who are bringing to the screen yet another of Sally's pieces.
The latest project, Unforgiven, a three part series for ITV, will be screened early next year and is a joint production with Sally's own company Sparkhouse Productions.
Keen followers of Sally's work will recall the gritty drama Sparkhouse, which starred Joe McFadden and Sarah Smart and brought critical acclaim for the writer back in 2002. It was inspired in part by one of Sally's all-time favourite novels, Emily Bronte's Wuthering Heights.
"This time I'm executive producer as well," says Sally. "It's lovely to be back here, even though it's like winter," she adds. Home for Sally, husband Austin and two sons George and Felix is now Oxfordshire.
"I love being on set because you can see how what you've written is interpreted. And they're all great here, they do listen to my input.
"When they started filming I was on holiday in France but they kept sending me the rushes to keep me up-to-date. It was so frustrating, I was itching to be back in the thick of it," she laughs.
She is keeping tight-lipped about the series but does divulge that the three-part story follows groups of people who appear to have nothing in common as the story starts, but who – viewers will gradually realise – "are all interlinked, and each of whom has the power to affect the lives of the others forever".
One of the stories involves a character, who is released from prison after serving 15 years for murder played by ex-Coronation Street star Suranne Jones. The series also stars favourites including Peter Davidson, Jemma Redgrave, George Costigan, Siobhan Finneran and Will Mellor.
Sally grew up in Sower-by Bridge and while she was a pupil at the former Sowerby Bridge Grammar School she realised she wanted to write.
After graduating from York University she headed to London and was soon working on scripts for TV and radio, including The Archers and Coronation Street.
Then a string of dramas followed including the much-acclaimed At Home With The Braithwaites, starring Amanda Red-man, The Amazing Mrs Pritchard, starring Jane Horrocks and Jane Hall – inspired by a short stint as a London double-decker bus driver when she first arrived in the capital.
As with past productions, Sally says research for Unforgiven has been something she has loved.
"I tend to write about things that interest me and then worry about the research later. For Mrs Pritchard, for example, I sat down and thought 'I don't know a thing about politics' so I better get some research done," she says.
"With this story, I knew I would have to find out about prison life and what was involved when someone was ready to be rehabilitated and releas-ed," she adds. So she visited Askham Grange open prison near York.
"To be honest I found the whole experience really uplifting. I had no idea what was meant by an open prison, not really, so it was fascinating."
Sally says she was always determined her latest drama would once more be set in the north – this time the locations are Halifax, Ripponden and Hebden Bridge.
"I love this area. It's where I grew up and where I know. I was adamant about not changing placenames but some had to be, sadly. There are places in the series I visited while growing up so I've enjoy-ed seeing those again."
Sally's work is now earning her fans abroad as well as at home, particularly in the States where Mrs Pritchard was a huge success.
"I was invited to this high-brow conference with all these high-flyers in politics and a woman who as well up in the CIA. I thought 'don't they know I just write about these things, I'm not actually involved with them?' I nearly said 'no' but I went and had a great time." she laughs.