The woman lodged a legal action claim against the governing body and the company that operates the Aviva Stadium in Dublin, New Stadium DIC.
It is understood that the ball was kicked into the crowd by a player, however, it is unclear whether or not an All Black was involved.
The IRFU said this weekend it would be “inappropriate to comment on any ongoing legal matter”.
Another female fan also lodged personal injury legal action for being hit by a ball during Munster’s loss to Saracens in the European Champions Cup in the same stadium in 2017.
Tim O’Connor, a barrister with a special interest in sports law, told The Times it was rare to see spectator litigation in “large-ball sports”.
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