How to understand it? are they allowed to be a Rabbizin? I mean ladies, and how was this tradition before?

ב"ה Shalom A learned woman, may give halachic rulings. (See הליכות ביתה פרק כ"ח:ח, pg. 395, Talmudic encyclopedia, "Hora'ah, Vol. 8, pg. 494, note 109. A woman, married to a Rabbi, in some circles is called a Rebbetzin, but that does not automatically make every Rebbetzin, a learned woman who can give halachic rulings. And even those who were worthy of giving halachic rulings their position has never become a public one. Over the generations we know of the daughters of Tzlafchad, of whom the Talmud says they were learned. (Baba Batra 119b). In the Talmud we know also of Bruria and Yalta who were also learned women. Also a woman is not permitted to serve a "Dayan"= a Rabbinical judge. (Shulchan Aruch Choshen Mishpat 7:4) . All the best