‘Regarding optional mitzvos it may not be halachically permissive to practice if one’s intentions are “shloa lishma”. ‘
And that is pretty irrelevant to torah study because women are obligated in all but about a dozen mitzvot from the torah. It is not an “optional mitzvah” for women to learn torah. I my neighborhood we have many women who regularly attend either daf yomi or in-depth gemara shiurim.