Joseph -“Rav said to R. Chiya: How do women [for whom Torah study is not considered a paramount duty] earn a share in the world to come? By making their small children go to the synagogue [where they learn Torah], and by making their husbands go to the yeshivah to learn Mishnah, and by waiting for their husbands until they come home from the yeshivah.”
This obviously isn’t the only way though to earn a share in the world to come. For single women also have a share in the world to come.
And like lilmod said, women get schar for learning Torah too, even if they aren’t obligated in it.