I think the OP’s analysis is how the modern schools (i.e. YU) use to justify teaching girls gemorah. But the Gedolei Yisroel of the Litvish and Chasidic world don’t make such an analysis, and simply follow the Shulchan Aruch. I think the halacha is pretty clear against formal schooling in gemorah for girls. I don’t believe prior to YU’s teaching girls gemorah have there been any schools formally teaching gemorah to girls in the Torah world.
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