How do you know Myrtle isn't intelligent?

Myrtle's lack of intelligence is often illustrated through her shallow understanding of the world around her and her misguided aspirations. She is easily swayed by materialism and social status, demonstrating poor judgment in her relationships and choices. Additionally, her conversations often reveal a superficial grasp of deeper concepts, indicating a limited capacity for critical thinking. These traits collectively suggest that her intelligence is not well-developed.