The new and distinct cultivar of perennial Salvia plant named ‘;Indiglo Girl’; characterized by its large strong violet-colored flowers densely arranged in dense verticils, with upright habit and stiff, upright; heavily-branched stems and strong vigorous growth rate and large deep-green foliage. Salvia ‘;Indiglo Girl’; is especially useful for landscaping and containerized ornamentals by itself or in combination with other plants.