If she could muster up the heart to, she'd punch him for that. As it is she's got both hands kind of full, one trying to desperately take some of his weight and make things a little easier, the other still pressed on that wound and still getting covered in blood. She settles for setting her mouth into a grim smile as she tips her head slightly into the touch. Like she gives a damn about the bloodied look right now.
"You're an idiot. You're an absolute idiot, you know that, right?" It's really starting to set in, the slowly sickening realisation that this is it. He's all she really has left in this world that's been laid to waste and abandoned by all others. Castiel and Anna and their tiny wisps of Grace, barely noticeable but a flawless reminder of what used to be. And now it's dying, he's dying, and soon it's going to just be Anna. He's leaving her to this desolate husk of an Earth, and for a moment she kind of hates him for that.
It's just a moment though, and when it passes she almost wishes that it hadn't. Instead of that sudden wave of frustration and rage, the loss slowly setting in the pit of her stomach is nearly unbearable. Her eyes close, she leans into his hand more and she heaves out a slow breath. "The things we all did. You deserve forgiveness, but you don't need it from me. There's nothing to forgive."