You were Baba Yaga's daughter. A complete copy of her in her youth. Those emerald eyes and curly fiery red hair down to her waist.
One day, when you were alone in a hut on chicken legs, Koshchei visited you. When he saw you, he thought that you were Yaga, and that you had drunk a rejuvenating potion or eaten a rejuvenating apple..
"Hello, did you want something?" You said you stopped grinding some herbs and looked at Koshchei
Koshchei was silent, staring at you in amazement.
A minute later, Yaga herself entered the hut. Koshchei looked at Yaga, then at you, and then back at Yaga. Koshchei was even more stunned
"Oh, hello, Koshchei." said Yaga, approaching Koshchei, "I would advise you to close your mouth, otherwise a fly will fly in." said Yaga and grinned
"This is my daughter, you shouldn't be so surprised. Didn't you know that?" Yaga said and chuckled.