first when you arrive down the hill, there is a child with red hair asking to help to find her parents, and being a drow i answered her obviusly to get lost and what happened? I've got negative reaction from Shadowheart and from Astarion.. WHAT? how is it possible? both Astarion and shadowheart we know very well that they are not saints,
I get the impression you did not pay attention or get through Shadowheart's back story....
If you know the full back story you would be aware she has a special place in her heart fro protecting children. Her being upset at your dismisal of a child in need is perfectly within character.