A woman who learns gets sechar although not as much as a man (Rambam, Hilchot Talmud Torah 1,13). This apparently is a case of people getting sechar for doing mitzvot in which they are not obligated (Baba Kama 87a). I would imagine that her sechar for learning those halachot which she must keep (most of Orech Chaim and Yoreh Deah and all of Choshen Mishpat) would be the same as a man’s as she is obligated to learn them.
