@NervesofSteel if she hadn't been greedy and stupid about these things, the entire scam would never have been uncovered, or the extent of their/her past criminality.
Ellias is cleverer than anyone else (Chloe on HNTDDD)
There seems to be a pattern in Sally's behaviour, in the way you have described. She successfully outwits, makes money out of it, goes too far, is disgraced and moves on/hides away.
The clerk to the court job - that she loses and is never discussed in the family.
The bookkeeper at The White Hotel, who has family to stay but loses that job.
The job for Martin Hemmings.
Haye Cider Farm.
The Raynor Winn empire, in its entirety.
The other side of the coin with always 'maximizing' her employment by making the most of the trust she exploits - she always takes it too far. Is it arrogance, compulsion, just once she gets in that groove she can't stop? Or, does a part of her want it all to stop so she can experience the relief - like in the letter to her late sister.
It feels like she has to retreat to lick her wounds, have some 'time out' but then regroups and renews her strength to focus on** a new opportunity. I firmly agree with @DisappointedReader The most important thing to me now is that they both retire from scamming and stealing.
But, they are always so self-righteous, and Sally attends to Tim with such fervour, that I am afraid there is nothing to expect other than their ugly trade will evolve in some other shape or form.
"Just remember Ellie, remember, this is for him." (HNTDDD by Izzy Wyn-Thomas)