She's got the devil's eyes
There are many things she might have expected to come from this meeting. However, Jesper declaring intentions to steal his son from Sylva, and thus from Loess, was not one of them. Of course, she had been aware of Eyas visit to Jesper. She has a vested interest in the girl, after all. But even she could not have guessed Jesper might choose this road to travel rather than any number of other ones.
None of this is displayed on her features. Her gaze remains impassive as she studies Jesper for a long moment before flicking her eyes briefly to Castile to catalogue his reaction.
There are many things she might say in response, but given her role here as largely that of witness, she remains silent. It is not her place to say what Jesper should do in regards to his family, even if, having met the boy, she does think his son will not appreciate being stolen in such a manner. Perhaps he had changed drastically in the intervening years, but she doubts it.
Her involvement would only become a necessity should Castile object to the plan. And as she peers at him, she does have to wonder at just how this revelation might sit with him.
and they'll cut you like a weapon