The Big Bang Theory made Missy pay for her sins in Young Sheldon Season 6. Despite being a standout character in the prequel series, Missy's appearances in The Big Bang Theory were limited. However, viewers learned that she didn't reach her full potential based on her childhood in Young Sheldon.
In Young Sheldon, Missy proved herself to be the best Cooper family member in various aspects of life. She was funny, charming, street-smart, and social. However, in The Big Bang Theory, seemed like fate had punished her for her rebellious phase. While the rest of the Cooper family dealt with their own issues, Missy offered support to everyone. She became frustrated with her parents' continued ignorance and acted out, attempting to leave Medford, Texas, and complaining about the town being boring.
Despite her desire to leave, The Big Bang Theory revealed that Missy never got the chance to move out. It was unclear where exactly she lived as an adult, but it was suggested that she was based near her mother, Mary. This contrasted with Sheldon, who was able to move far from their hometown, and Georgie, who didn't seem interested in leaving the state.
In her final appearance on The Big Bang Theory, Missy was pregnant with her second child and going through a separation from her husband. Although the show didn't delve into her marital woes, Jim Parsons' narration in Young Sheldon provided an update. Missy eventually found happiness in her personal life, remarrying an unnamed man and having more children. However, her professional life remained unknown.
Overall, The Big Bang Theory portrayed Missy as paying for her actions in Young Sheldon Season 6. Despite her potential and positive qualities, she faced limitations and challenges in her adult life.