In the summer of 1649, the Haddington witch hunt drew Margarit Robertson into the legal machinery of the Scottish kirk and state. Her involvement began when she was named by another woman, Margaret Veitch, whose own testimony acted as the catalyst for the scrutiny Margarit would soon face. On July 25, 1649, Margarit was brought before the authorities to address the accusations levied against her.
Following her initial appearance, records indicate that a confession was formally extracted from Margarit on that same date. While the specific nature of the accusations and the content of her final admission remain absent from the extant trial documentation, her case—catalogued under reference C/EGD/1337—proceeded through the judicial system of the era. Despite the existence of subsequent trial records, such as T/LA/1024, the surviving archives offer no further narrative detail regarding the ultimate outcome of the proceedings against Margarit.