Padmavathi Thayar is also an incarnation of Sridevi. Harivamsa purana states about Neeladevi Thayar. She incarnated as Nappinnai during Krishna- avatar. References about her are stated in Divya Prabandham and also Thiruppavai talks about her.
She can be worshipped in some places; there is a sanctum for her in
Srirangam.