This article examines how trauma and affective injustice permeate the school life trajectory of a female student (Sofia) in Argentina. The study is theoretically grounded in the field of trauma studies in education and contributes to this literature by attending to affective injustice, a concept that has not received much attention yet. This study foregrounds Sofia's experience of affective injustice and demonstrates that this concept is crucial in further understanding students' experiences of affective trauma in school. Assembling rich materials (report cards, interviews, psychologists' reports, social media posts, autobiographical texts) that span over a period of 17 years, the study uses qualitative perspectives to show how Sofia understands and experiences affective injustice in various phases of her school life. In particular, these experiences are presented in the form of an assemblage of expressions showing how Sofia communicates her claims of affective injustice using varied means and resources ranging from linguistic, behavioural, biographical, creative, emotional, bodily, and artistic expression. The paper concludes with a discussion of the educational implications of the study.