Malkova Natalia called herself the mother of the girl

Malkova Natalya called herself the mother of a girl born to her minor sister Nina, and was recorded as a mother in the birth certificate on the basis of a certificate from the maternity hospital indicating the name and initials of the woman in labor. Five years later, she turned to the registry office with a request to correct the act of registration in the girl’s birth certificate, since she married, has her children and does not want to be considered the mother of a child born not by her.
Solve the problem.