sri-radhara dasi-madhye yanra nama gani
madhavi-devi—of the name Madhavidevi; sikhi-mahitira—of Sikhi Mahiti; bhagini—sister; sri-radhara—of Srimati Radharani; dasi-madhye—amongst the maidservants; yanra—whose; nama—name; gani—count.
Madhavidevi, the seventeenth of the prominent devotees, was the younger sister of Sikhi Mahiti. She is considered to have formerly been a maidservant of Srimati Radharani.
In the Antya-lila of Caitanya-caritamrta, Chapter Two, verses 104-106, there is a description of Madhavidevi. Sri Caitanya Mahaprabhu considered her one of the maidservants of Srimati Radharani. Within this world, Caitanya Mahaprabhu had three and a half very confidential devotees. The three were Svarupa Gosani, Sri Ramananda Raya and Sikhi Mahiti, and Sikhi Mahiti's sister, Madhavidevi, being a woman, was considered the half. Thus it is known that Sri Caitanya Mahaprabhu had three and a half confidential devotees.
Link to this page: https://prabhupadabooks.com/cc/adi/10/137