Is the congregational prayer of women, led by one of them, valid?

A woman leading other women in prayer (imamat) is permissible, and it is sunnah (definition) for her to stand in the middle of the first row. If the woman leading prayer stands ahead of the female congregants, the prayer of all is valid according to the correct and more preponderant opinion, despite the existence of another opinion that considers it invalid. If a woman prays behind another woman, not to her right, her prayer is valid according to the majority of scholars. The imamat of a woman is valid even if it later becomes clear that the one she led in prayer was not yet an adult.