According to the Tamil text Sri Venkatachala Mahatyam, Sita, as Maya Sita (an illusionary Sita), is related to Vedavati, and her next birth is Padmavati, not Radha.
Here's a breakdown of the account:
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Vedavati's Curses: Vedavati, while performing austerities, was harassed by Ravana. Enraged, she cursed him that she would be the cause of his destruction. To protect her virtue, she immolated herself in a fire seeking the protection of Agni.
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Rebirth as Maya Sita: Vedavati is believed to have been reborn as Maya Sita, an illusionary Sita created to protect the real Sita during her abduction by Ravana.
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Padmavati: Following the events of the Ramayana (including her role as Maya Sita), Vedavati is reborn as Padmavati, who later marries Lord Venkateswara (an incarnation of Vishnu) at Tirumala.
Therefore, according to this specific text, the answer is Padmavati.
