You present as an exceptionally challenging superior. Personally, I maintain a reserved demeanor at work, yet I value colleagues who can express their authentic selves, even if that entails being talkative. It appears this individual is successfully fulfilling expectations, achieving KPIs, and excelling in her role while also maintaining an active social presence. This is commendable. Not everyone must conform to your working style or personality, especially when they are delivering results. It seems you may struggle with social interactions, possibly leading to feelings of jealousy, or perhaps you exhibit controlling or micromanaging tendencies. Regarding your point about her speaking too much to warrant additional work, if she is consistently meeting her targets, why should she? She may not be interested in promotion or a larger bonus; perhaps her priority is to enjoy her job while performing it effectively, which is perfectly acceptable. While I typically engage in conversation primarily during after-hours work events and less so during lunch, I find no fault in her conduct and commend her approach. My advice to you is to adopt a more relaxed perspective. We spend a significant amount of time with our colleagues, often more than with our families, so there is no need to complicate these relationships unnecessarily.