Answer: post-purchase dissonance.
Step-by-step explanation:
Post-purchase dissonance is a consequence of the disparity between someone’s decision to buy something and the evaluation he had previously made. It´s especially likely when the putchase is irrevocable, such as when buying a new car like in this example. It´s unlikely that that decision can be reversed.
Seeking new information to back her purchase is how Carla attempts to reduce dissonance.