Her deck apparently doesn't change, or doesn't change much at all.
So the same old high level LIGHT monsters deck with Vassal, should still work to farm her.
I was thinking the same thing; 3 blue eyes, and bunch of 2500+ Light monsters (Rabidragon, Blackluster Sacred Soldier, Neos, etc) and use Vassal to go over their defenses.
Emes the Infinity, Super Conductor Tyranno, Photon Wyvern, and Divine Knight Ishzark would be good choices too.
Really, while other attributes can do the same strategy, LIGHT monsters are the best for this, since the variety works best against her deck, which is ironic since she also plays a LIGHT deck lol
LIGHT is also the best attribute against her for one reason you forgot to mention: her Radiant Spirit, which destroys all non-LIGHT monster if you destroy it in battle
I second the use of Ishzark. Really good against Unknown Duelist if you can boost it a bit to avoid getting hit by stuff with higher ATK than it (I use Power of the Guardians on it).
If you banished all of her Duza, she can't make use of Cubic Wave, which is honestly her only annoying card.
Easy way to stun Prana : reveal Subterror Final Battle on your field as intimidation, normal summon any high level Subterror then change it to face down defence. Prana will never attack you until your final turn, Radiant Spirit and all her backrow can't do anything. If you use Subterror Stalagmo's effect of drawing 2 cards every flip, you can finish the farming in less than 15 turns
Thanks for the Subterror deck. I've been wanting to play a 'new' farm deck since I've used the exact same ones for the past however many events. Gets kind of stale.