This is the 6412th most frequent Chinese word.
挂帅
"挂帅" means "to take the lead or assume command."
挂帅 is used here to indicate taking on a leading or commanding role.
他在这个项目中挂帅，负责领导整个团队。
He is leading this project, responsible for directing the entire team.
挂帅 in this context emphasizes the singularity of one person taking a lead role, which contrasts with the importance of teamwork.
在解决问题时，我们不能只让一人挂帅，而需要整个团队的协作。
When solving problems, we cannot rely on just one person to take the lead; the whole team needs to collaborate.
挂帅 is used here to highlight that she is the leading figure in the development process.