Sometimes - and it doesn't matter whether it's a new, difficult pattern or one she's knitting from memory - she'll stop, pull her needles from the yarn and "rip out the pattern." She holds whatever she's knitting in one hand, grabs the hanging yarn in the other and pulls.
All the stiches come out. All that knit-one-pearl-two gone. History. Obliterated. Forever. No CTL-Z, no undo, only a...
The first time she ripped out a pattern I exclaimed, "What are you doing?"
"I'm ripping out the pattern."
"But all that work..."
"Doesn't matter. It wasn't coming out right."
And this is where the magic happens, this is where the great learning (for me) takes place.
She doesn't completely unknit whatever she's working on (okay, sometimes she does and it's not often). She'll rip out the pattern "...to where the pattern is still good" and pick up from there.
Finding Where the Pattern is Still Good
What Susan's doing is something I do in my writing. I'm not as adept at it as Susan is with her knitting.
It goes like this; I'll be writing along and all of a sudden everything stops. The writing is good, it's flowing, excellent use of language, good character development, moving the plot along, atmosphere is there without being noxious, imagery moves the story forward without pulling the reader out of the narrative, ... and still everything stops.
Basically, I've written something that some part of me, some deep non-conscious nugget of brain tissue somewhere between my amygdala and my hippocampus has said, "No, uh-uh, wrong," and shuts everything down...
...and I mean, Down! I can't write a period, I can't change a semicolon to a comma. I'm writing like a sun going nova and then I'm a black hole sucking everything in and not letting anything out.
More often than not I'll spend a day fighting myself even though I know I have to "rip it out to where the pattern is still good".
Rip It Out
What's really funny is that I can look at what I've written and know where the pattern went bad. Most times I don't even need to look, I just know. And the more I've written beyond where things went bad the worse it gets, meaning it's further and further from the original story because I started working to bring things back to where they should have been rather than just turning around and getting back to that bad turn in the road. Or story.
Ever done that? You know you've taken a wrong turn and you know you can turn around but oh no, you'll just take the next turn and hope it gets you back to where you're suppose to be.
That might work in the city where most blocks are rectangular and you take three left turns and get back to where you started. Do that in the middle of the country and the next thing you know the natives are speaking a different language.
Stories (at least mine) tend to be country roads. There may be some great scenery and amazing stuff along the way but I'm getting further and further away from where I want to be. Best thing for me to do is turn around, rip it out, get back to the last good part and start off again.
Nothing's Wasted in the Multiverse
One advantage I have over Susan is that ripping things out of stories until I get to the last good part is easy (sometimes too easy) to do, especially these days. I cut what's not working from the story. Easy to do with word processors (I wonder what my heroes - Poe, Wells, Verne, Mansfield, Hammett, ... - did without them. Aside from write better, I mean...).
But then I save it. It's usually some fine writing, simply not writing that's relevant in the current project. Change a name, change a few background images and you can turn that bad left front into a dazzling opening in some other story, that bad sleeve into a wonderful climax somewhere else. Nothing's wasted and just because it doesn't work in this story's universe doesn't mean it won't work in that story's universe.
So the next time your writing goes dead, stop. Get out of your car. Look around for the last good turn, the last good part in the pattern. Save what you've written and write again.