Honestly I had trouble figuring her out too.
On one hand she seems to value trust and loyalty. Me not selling out Astarion got her to flirt with me.
On the other hand trying to help the tieflings and doing the morally right thing is something she disapproves us.
So I guess as long as I am loyal to her and don't betray the trust of my friends she doesn't care what happens to others?
She doesn't disapprove of helping the tieflings. She disapprove of your offering your help to others or getting involved in random drama when you should be focusing on finding a healer. Just stick to what looks like neutral responses when accepting quests.
Unless it's about trolling, using deception or demanding that people gives you all their valuables. She approves of those things.
