Skandapurana 6.3.200.10

6.3.200.10

pradoṣe tu punaḥ pārtha śvetā pāṇḍuramūrdhajā .
sumṛtā tu durgakāntāre mātṛvatparirakṣati .. 200.10 ..

At dusk, again, O Pārtha, [she is] white, with pale-grey hair; / when remembered well in an impassable wilderness, she protects like a mother.