Final answer:
According to Freud's theory of personality, Isabella's consumer behavior is most likely driven by the id.
Step-by-step explanation:
According to Freud's theory of personality, the component that most likely drives Isabella's consumer behavior is the id. The id is the part of the unconscious mind that is responsible for fulfilling our instinctual and pleasure-seeking desires, without considering the consequences or social norms. Isabella's tendency to seek hedonic consumption and not control her desire for buying and consuming aligns with the id's pursuit of pleasure and immediate gratification.