It's not that she's keeping a strong face to hide how scared she is.
Dean wonder if she can 'win' in the trial tomorrow with the face she has now, which looks terrible, and point out how she's kept everything inside, not complaining, not crying and just move forward. Why is she forcing herself.
Iris answer that she's not forcing herself or anything.
Dean pushed further, Iris clarifies that because crying won't change anything
Dean pushed again, saying that even if showing tears might not change anything, she might be able to settle the feeling inside. That the way she did was...dangerous. And results in her current face.
Which Iris snaps at him. Even if she cry, or complain, what would be resolved? NOTHING.
She starts with explaining that yes, she was mortified, even back when Edward broke their engagement.
And this time, the fuck is with this excommunication BS
Not to mention just because of her, even though everyone's been working hard to make it this far, her ordeal is being a hindrance to that.
Tears fall around this point.
BUT, she continues.
For her to cry and beg to be saved would just have them 'retire' her from society
But even so, she's caused too much trouble already, this is no longer the point where she can just run away alone. Just because she's not around doesn't mean her 'crime' would disappear.
"I don't cry because I'm pushing myself...? That's wrong. Because even if I cry nothing will change...because I'm afraid if I cry, the others will be disgusted with me....that's why I won't cry!"
"I'm not strong. Just that, I'm a human who wanted to look strong...yet can't even do that...that's me"
Then she bawled.
Except Dean didn't console/comfort her, he chided her.
That she shouldn't force herself just because she's strong.
That everyone agrees that considering her position, she couldn't show weakness or hesitation.
BUT because of her not showing those feelings, those following her can't help but be worried, and don't ever forget that.
What Dean did though, was suggested he'll do her works in her place so she can rest easy.
The next day she woke up with some reds around the eyes still, but she looked a lot more refreshed.