The current study is a two-year case study focusing on an upper-elementary girl who had been diagnosed with selective mutism in 1st grade. While multiple theoretical frameworks have been used to explain selective mutism, the current study borrowed the frameworks of critical sociocultural theory, a social semiotic theory of multimodality, and self-efficacy theory. The data consisted of daily field notes written by the researcher, video and audio recordings, artifacts of schoolwork and student written communication. The researcher served as Tina's learning specialist in Year 1 and her homeroom teacher in Year 2 during the data collection period. Those data sources were used to explain the evolution of new insights, identities, and pedagogical practices designed to support Tina in the school setting. The findings showed that being attentive and observant, establishing a safe learning environment, and cultivating a strong teacher-student relationship were critical to student success. In addition, the role of writing as a communication tool and use of digital tools supported Tina's growth. In conclusion, implications for teacher development will be discussed.