Revākhaṇḍa of the Skandapurāṇa manuscripts (RKS) 91.27

91.27

dvādaśābdāni sā tīre gaṅgāyāḥ samavasthitā /
tyaktvā gaṅgāṃ kvacid rājaputrī kāṣṭhāṃ tu dakṣiṇām //

She remained on the bank of the Gaṅgā for twelve years. / Leaving the Gaṅgā at some point, the princess [went] to the southern direction;