72 (70*). The Mitzvah of Kiddush II
A woman is obligated in the Mitzvah of Kiddush just like a man. However, if a Bar Mitzvah boy wants to make Kiddush for his mother and it is uncertain whether he has already reached the Halachic definition of maturity, otherwise known as Shtei Saarois, he is not allowed to make Kiddush for his mother because he has a lesser obligation of Kiddush than his mother or his father do. If it is on Friday evening and the woman davened already, then it is a bit of a different situation, and there may be room for leniency. The same rule applies in a girls’ camp or a seminary. If a younger girl who is already Bas Mitzvah but about whom it is uncertain if she possesses the signs of Halachic maturity wants to make Kiddush for an older girl, it can be a serious problem, unless it is Friday evening and the older girl has already davened Maariv.
* #70 in the text email & publication