Celes has a mature and gentle air about her yet also child-like. A hidden open-mindedness could be sensed within her. She is a bit too nice. According to Rem, the reason Galluk's  ego got so big is that Celestine coddled him too much, and he came to believe he's incapable of wrongdoing. In fact, Rem seeing Celes frown is a sign that a line has been crossed. When Rem informs her that Demon King Krebskrum has been reborn as a small child, rather than alert the kingdom, the church, and the world, she agrees to meet the little girl first, in person, and in as private as she can. It helps that Diablois also present, and he's proven himself trustworthy by repelling a Demonic being attack numbering 100 or so, and saved the town from Gregor first, without asking for a reward.