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Also simply because of how her Quirk works she was even fucking stronger against him, he had a Quirk that inflicted fear, she's on massive amounts of adrenaline and at risk of falling, Her Heart is hammering like someone replaced it with a jack hammer, and how does her quirk function?
By using her own heartbeat transmitted through her Jacks.
At that moment not only did it directly oppose Radio Waves, it was at the strongest it would ever be in her life, then the shock of losing her ear did that again.
In that moment she was the final way to stall him, that scene of Jirou stunning AFO by unlocking the vestiges of the stolen quirks, she created her own Tien Vs Semi-Perfect Cell situation, there were stronger candidates, but in that moment it was a Young Woman facing down Fear and Death, and faced it was Anger and so much Passion that it overwrote mental blocks.
Kyouka Jirou deserves the Best Girl Title for simply fucking up AFO's ass so bad.
we ARE aware that jirou's heartbeat wall is the fastest, most direct counter to all for one's radio waves, right???? we are aware that in the planning it was probably considered that when shit hits the fan, she's their biggest shot at opposing that??? we're aware that she's one of the examples of the indomitable human spirit and strength of will in that arc given she (and tokoyami i guess but this isn't about him) literally woke up the spirits of the quirks within all for one and that they all would've died without that??? right??? RIGHT????