As for the writing there being insufficient
What i mean is that if you do interfere it leads to exact same lines regardless of your relationship status with her, regardless of approval she will give an aggressive jarring response like "If I have to step over your corpse to fulfil what Lady Shar asks of me, so be it." There is no variation at all or depending on how you influenced her. And you know, trust goes both ways? If you have a good relationship shouldnt she be more charitable, more amicable?
And what of the lack of reactivity? The scene is written as if were the only 2 people there, but if my other companions heard her talk like that i'd imagine they'd comment on that and call her crazy or something, maybe even support what i'm telling Shadowheart.
See there are a lot of areas where this interaction could have had more depth and permutations in a character defining moment.
