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In future chapters, Arai and Mari will start making it a point to catch up with Emily and they will end up sparring directly with her. Though in the end the way that they train comes down to what kind of speed they excel in to keep up with Emily.
Arai would be the type to keep up in terms of full-body agility, meaning their spars take place over an entire area as they constantly move around trying to out-maneuver each other to the point it ends up looking like a DBZ or maybe certain JJK battles as they blitz around the field and cause tons of environmental damage with their clashes.
Spar sessions between Emily and Mari however would be like pic related where they just stand in one spot for hours as they spar in bouts of dexterity, becoming mere blurs of motion as an unrelenting storm of clangs and clashes as they break dozens of swords and turn the entire immediate radius around them barren as thousands of slash marks are left in the ground outright before the sparring is done for the day. They only bother stopping when they get hungry.
All 3 girls will basically be monsters in their own rights in time.