Paula Vennells' counsel is going for a highly forensic approach going through various points of Vennells' knowledge and involvement and arguing that there's no actual proof that she knew or did anything. It was her underlings, they kept the bad stuff to themselves, and they're the ones who should be thrown to the wolves. Much of the blame is being put on Susan Crichton.
So far in these submissions Vennells has accepted no responsibility for anything. To not do so would be a huge mistake so I assume there'll be a mealy-mouthed and very narrow mea culpa at the end. Maybe "my only mistake was to be too trusting of those around me".
Taking this at face value, maybe a just outcome would be for Vennells to hand back all of the pay and bonuses she received since, according to her counsel, she spent her years as CEO not actually doing anything at all. Well, apart from playing mean girls with Alice Perkins.
To be honest, I do think there's something to these submissions. Vennells was the perfect (passive and useless) person to be put in charge of a company having a rotten culture that would do anything to avoid that being changed.