I see what are you doing here uhhhh!!!
Well, per se? Not that much, Emma is like any child who has some of their family member ‘stolen’ from them, she goes into a jealoooousy strike. Especially since Jack and she are really close siblings, though they don’t got to see each other as much as she would like to.
She haven’t meet the Sandman personally, and what she knows is mostly from Jack, which only helps to feel like the older spirit is taking him from her.
But they all get better by the end…