There are some facts about Shreya that distinguish her from an ordinary Chelish child.
She is Cunning, which is common in the Nursery Attached to Corentyn Wizard Academy that feeds children so that their wizard parents won't be distracted from serving Asmodeus, and even moreso Wise, which is not common among wizards' children.
She does not feel that she is a pathetic mortal worm deserving punishment and desperately needing correction from her superior. Only for once was she tricked to feel that way when she was three and asked a question about why Asmodeus agrees with Pharasma's sorting instead of sending everyone to Hell. Before she even knew that was heresy. And everyone got spanked because of her heresy. However, in the middle of that thought, Shreya recognized that thought and realized it's stupid that they blame not just her but other children who did not asked the question. And also, why can't they just answer the question.
She does feel stressed, punished or frustrated as a normal Chelish citizen does, but her coping method is correctly attributing her suffering entirely on the natural inferiority and malice of others. Shreya isn't comfortable not because of she sucks, actually she's the best one ever, so it's whatever else that sucks. For example, stupid rules stupid adults stupid babies and stupid mishap. It's stupid rule that children must recite and copy Asmodean prayers over and over again that rhymes poorly and calls them pathetic mortal slaves and does not help with improving their reading because children don't like it and won't appreciate it and are not respected by it and will like Cheliax and Asmodeus less because of it. Stupid adults should make up better prayers that respect her Pride because Asmodeus is a god of Pride and is not stupid. The whole world of Abyssal stupidity should be corrected by Asmodeus or if Asmodeus is too busy, should be corrected by her, the actually thinking one therefore the best one ever.
She does not, as Chelish reinforced learning often suggests, deny her heretic thoughts of she is the best one ever because why would anyone do this. She seldom thinks about it, because not thinking something doesn't mean it is false. It just means that it helps with her goal of not getting hurt. Spells have cost and wizards usually don't run Detect Thoughts on five-year-olds. A wizard student did it once for school practice and Shreya got Acid Splashed because she was thinking about stupid adult rules. That wizard student didn't report her as this is the standard punishment on nursery children, and they think she learned a valuable lesson about not being a heretic. That's not the case.
She didn't err again because she since then learned to focus on thinking surface thoughts of something else like obeying superiors. She learned to not get hurt by actually obeying (stupid) adults and orders and rules just as anyone else. She learned to not get hurt by Bluff and control of facial expressions normally. She appears not suspicious and rebellious at all because behaving like that equals getting hurt. It's just that behaving like a Chelish child and thinking obedient surface thoughts for a thousand times like a Chelish child does not necessarily require to believe the same things as a Chelish child.
And, at the bottom of her beliefs, there is a little voice saying: The best one ever should not get hurt. Something is horribly wrong if she gets hurt.