Interestingly, I don’t really conceive of Portunista as someone who has trouble taking responsibility for her actions – on the contrary she’s so strong in that regard (which isn’t inherently a bad thing) that one of her besetting temptations is to pervert that responsibility into tyranny and resentment, over against the responsibility of other people, and treating their active responsibilities as being essentially a competitive threat to her.
Which by no coincidence, is typically how the demons operate and think of active responsibility, too. (And Artabanus. And Bomas in a somewhat different way.)
The characters who have trouble taking serious responsibility for their actions are Gaekwar and Seifas, each in somewhat different ways. Gaekwar has fine intuitions about justice, but uses his pain as an excuse to avoid accepting as much personal responsibility as possible. Paradoxically, that means he has to exercise some personal responsibility as a commander (which he’s fairly talented at) in order to avoid being saddled with all kinds of responsibility as a minor soldier! (Plus obviously he comes from a wealthy and privileged background despite his chosen nomme de guerre, or however the French spell it. 
He isn’t about to just give up the best standard of living possible in a situation. I’ll be putting that more to the test in Book 4.)
Seifas has painfully strong notions of personal responsibility, and doesn’t realize yet how hard he tries to dodge personal responsibility to protect himself from the pain of responsibility. That’s going to result in a tragedy soon. (After which his natural temptation will be to leap off that horse on the other side. Again, on plan for Book 4.)
What Portunista does need to learn about insisting on her rights and responsibilities, is that other people are affected by her responsibilities – which she already knows, because she intentionally tries to affect other people in her favor – in ways which she wouldn’t want to be affected herself. Which she also kind-of knows, but at the moment she thinks of that as being a reason to competitively protect herself. Do unto others before they do unto you. 
She starts to learn a little sympathy for people who pay for her choices in CoJ, but she has a long way to go on that, especially after hardening her heart again against being hurt again at the end (of the main narrative in CoJ, not her contemplations several years later.)
I hope that doesn’t cause problems with relating to her for purposes of your own positive growth; but I thought I ought to head off a potential problem at the pass: there are truly horrible ways to insist on personal responsibility, too.
Though you’re quite right if what you mean is that she shirks moral responsibility! – but she shirks that as a factor of what she sees as competing personal responsibilities trying to enslave her. She intentionally misreads one kind of threat (the glorious kind) as the other kind of threat (the horrible kind that legitimately ought to be fought – but not by turning into the horrible kind of threat herself! 
)
Well, I could type out thematics all night. 
But Sonia and Cindy have both read pretty far if you want some motherly-hearted women to talk to about what you’re getting out of that book. (Very possibly I wouldn’t be appropriate myself! – but if you thought so, you could pm me about whatever you wanted to talk about. No pressure.)
I can try porting relevant posts back over to the other thread…?
)