I don’t think it conflicts with her personality at all. We see her start out young and idealistic, but she spends her entire Jedi career fighting a war and is slowly hardened somewhat by it. She has questions about how the Jedi are handling everything, but has respect for the more experienced Anakin and Obi-Wan, so she suppresses her doubt. After leaving the Jedi and looking at things from the outside, she sees things more objectively and her doubts become more justified in her eyes. Combine these doubts with narrowly surviving Order 66, and later on encountering Anakin as Vader, and I can she how she would want to proceed with extreme caution.