Story of Krishna's sister, Ekamsha

We all knew that there was girl born to Yasodha on same day Krishna was born and they got exchanged. A majority of people doesn’t know what happened to her.

But Harivamsha tells a bit of her story as well.

Here is the excerpt from Harivamsha where Krishna came back to Dwarka and met his own family after killing Naraka.

All the women among the Dasharhas and all of Ahuka’s wives joyously came to the assembly hall, desiring to see Vasudeva. With Devaki as the seventh, the seven daughters of Devaka were there and so was Rohini, beautiful in face. They saw Krishna and the mighty-armed Rama, seated. Ignoring the precedence of age, Rama and Keshava first greeted Rohini and then, Devaki, Devaka’s daughter. Because of these two sons, she looked even more radiant, like Aditi, the mother of the gods, with Mitra and Varuna. At that time, her daughter approached those two best among men. Men knew her as Ekamsha, the one who could assume any form at will. She was born at the same instant as the lord and it was because of her acts that Purushottama was able to slay Kamsa and his soldiers. This maiden was brought up among the Vrishnis, worshipped by them. Because of Vasudeva’s instructions, she had been reared as a son. She was born at the same instant and men knew her as Ekamsha. This maiden, Yogamaya, was invincible and was born for Keshava’s protection. Cheerful in their minds, all the Yadavas worshipped her. Divine in form, she was born so that she could protect the god, Krishna. Madhava saw that his beloved friend had come, and like a friend, held her with his right hand. In that way, the extremely strong Rama also embraced the beautiful one. He inhaled the fragrance of her head and held her with his left hand. Between Rama and Krishna, everyone saw their beloved sister. Her hands held a golden lotus and she was like Shri, whose abode is the lotus. All the women who had assembled showered down a great shower of parched grain and many kinds of auspicious flowers. They then departed to wherever they had come from. All the Yadavas worshipped Janardana. They happily sat down and praised his extraordinary deeds. The mighty-armed one, who enhanced the affection of the citizens, was worshipped. Because of his great deeds, he amused himself among them, like a god.

Ref - Debroy, Bibek. Harivamsha (Kindle Locations 5792-5804). Penguin Books Ltd. Kindle Edition.

I have quoted from critical edition of Harivamsha which is translated by Bibek Debroy.

According to Harivamsha Krishna’s lost sister and daughter of Yasodha was known as Ekasmha. She was raised by Vrishnis. She was also known as Yogamaya.