According to this extract from the Uttarakhanda of Padma Purana there is a Goddess named Kotara/Kotaraksi that was worshiped by Aniruddha (Krishna's son) during his battle against Banasura. Krishna established her tirtha at the bank of a river.
1-13. A little away from it is the excellent Siddhaksetra, O goddess. Formerly Aniruddha was chosen by Citralekha for Usá.
He was taken to Banasura's city formerly and he stayed in his (i.e. Banasura's) house. Checked by nooses and arrows, he then remembered Kotaraksi.
She is actually the power of Visnu, always engaged in protecting (the devotees). Krsna installed (the image of) this goddess here on the bank of the river. Due to the hymn of Aniruddha, returning to Dvaraka, after having vanquished Banasura in a battle, she actually came near (him).
She seems to be the same goddess mentioned in this portion of Harivamsa known as Kotavati.
Although I am more interested in this sentence that Mahadeva narrated to Parvati:
Kotaraksi has a universal form. She has great divine power. She is superior in strength. She in Tripura, is the destroyer of Tripura; is Siva and of the form of Siva. She is said to be the daughter of Sarasvati. She is Durga. She removes misery. She is Bhairavi, Bhairavaksi, and Laksmi, to whom the people (i.e. devotees) of the goddess are dear, O Chief goddess. Thus various names (of her) are mentioned.
How did Kotara come to be Sarasvati's daughter? I am assuming this refers to the Goddess Sarasvati consort of Brahma.
Here (page 601 of the pdf) are the Sanskrit verses of the above quote if it helps. I've put them up as a screenshot because the copy-paste translated them as gibberish. 
