Aria looks like not used to the feeling of sincerity since the previous her are know the 7 sins (pride, wrath, lust, gluttony, greed, envy, sloth) on early age because of her way of living and then died because of that 7 sins. So this is really showing that shes actually not really know whats doing the opposite of the 7 sins 🙂 this is showing how her character improve to show theres actually hidden kinddess inside her and not all of it actually villainous plan.
This is just what i thought 🙂 the 7 sins are just to get easier explanation of her life before reversing the hourglass. If its hard to understand then sorry since its actually hard for me to also explain in english 😅