I've found an okay way to farm by just adding the god cards to a basic dragon beat down deck. With three luster dragons at 2100 and a ton of spells and traps, it is easy enough to get 3 monsters. Then I just wait until she decks herself after I get Ra/Slifer on the field. Kind of a cheap way to farm since I'm only getting 5000s/6000s, but the rainbow packs drop. I might be too late for more...
White Elephant‘s Gift and Shard of Greed to draw cards, Counter Counter and De-Spell to counter the traps or trigger and destroy the Field Spell. Horn of the Unicorn to get Gate Guardian over 5000 atk
The drops and scores are better now with the campaign bonus. She gave me a prismatic Meltiel and a skill! I just want at least one more divine punishment.
What I do now is summon Ra first, then summon Slifer and wait to attack her directly for 7000 damage. That way, I can get cards on the brink, comeback victory, over 5000 damage, low lp, etc. With the campaign bonus, I get assessments in the high 8000s now and it is better.