Georgia has shown that the two triangles are congruent. Sometimes three transformations are not necessary when mapping one triangle onto another triangle.
In this case, the translation and rotation that Georgia performed are sufficient to map triangle ABC onto triangle LMN, which demonstrates that the two triangles are congruent without requiring a reflection. The important aspect of triangle congruence is that it can be achieved through various combinations of transformations, and not all three types (translation, rotation, reflection) are necessarily required.