Devibhagavatapurana 9.16.49

9.16.49

śrīrāmāgnī ūcatuḥ
tvaṃ gaccha tapase devi puṣkaraṃ ca supuṇyadam |
kṛtvā tapasyā tatraiva svargalakṣmīrbhaviṣyasi ||

Agni and Râmachandra both of them then said to Chhâyâ Sîtâ:-- “O Devî! Go to Puskara and practise tapasyâ there; that place is the giver of religious merits and then you will be the Svarga Laksmî (Laksmî of Heaven).” Hearing this, the Chhâyâ Sîtâ went and practised tapasyâ for the three divine lakh years and became Mahâ Laksmî. This Svarga Laksmî appeared at one time from the sacrificial Kunda (pit). She was known as the daughter of Drupada and became the wife of the five Pândavas. She was Veda Vatî, the daughter of Kus’adhvaja in the Satya Yuga; Sîtâ, the wife of Râma and the daughter of Janaka in Tretâ Yuga; and Draupadî, the daughter of Drupada, in the Dvâpara Yuga. As she existed in the Satya, Tretâ, and Dvâpara Yugas, the Three Yugas, hence She is Trihâyanî.