I don�t ever remember having a 30 dice check even when I was trying to persuade her. I remember it being a 20. I do think that level of approval has an effect on the dice rolls, at least as I can recall from Lae�zel�s zaith�isk scene. (I do remember a lower threshold when romancing her, pretty sure.) But with Shadowheart nowadays, I just have her eat the Noblestalk mushroom in Act 1, and then I trust her to do what she feels she has to do. And she spares Nightsong every time. I do think that how you approach your interactions with her does affect the main story, like choosing respectful dialogue options that give her agency or making sure that the small interaction with the Noblestalk happens. That stuff directly leads to different story outcomes, and also new dialogue branches. If you do give her Noblestalk, restoring one of her memories, she expresses doubts about her faith multiple times in act 2, for example. This does not happen without the Noblestalk. So there is definitely an impact. Granted, this is not a romance specific interaction. But I feel like it�s the people who romance her who are most invested in her story, and most likely to make sure that the �secret� interactions happen?
I've played Shadowheart's romance on my first playthrough, when the game launched, and I think it was a dc30 check. It's possible that they have changed it and made it overall easier to choose the good route, because on my current DU run, my DU told her to do whatever she wants, and even with just 'fair' approval she didn't kill Aylin. That was with a non-romanced Shadowheart. I didn't give her the noblestalk, and I only had her in the party in the beginning (which was enough to gain the fair approval), but after I got Karlach she stayed in camp. I actually expected Shadowheart to kill Aylin, since I didn't even bother interacting with her in camp, but it seems to be very easy now. Funny thing, I didn't even manage to uncover she was a cleric of Shar, because her dialogue in the blighted village bugged out.
