When examining success in mathematics education, it should be taken into consideration that it is important to examine teachers' work with their resources. In this study, it is aimed to examine this work through the processes of using and transforming the resources into documents. In this context, the "Documentational Approach to Didactics" is adopted as a theoretical framework. Reflective investigation method is used to analyse teacher's documentational genesis. The study is designed as a case study, with a primary mathematics teacher whom we named Olcay, who is very open to share her experiences that is important for the research. Various interviews with and observations of the teacher are made according to the requirements of the reflective investigation method. As a result, some of the schemes of the teacher to transform her resources into documents are revealed. It is seen that some of these schemes are similar to the ones discovered before and some of them are changeable according to the area where the teaching happened.