>>13492367>>13492593Enchanting and poisons would bring the total arrow count down but for the sake of stealth-archery she would also need appropriately strong gear as sneak attack only applies the bow and arrow's total damage and not the additional damage from enchantments or poison. Oh and weakness effects have to be applied before damage and if the first attack has a weakness effect, it will not actually enhance the damage.
tl;dr, game's balance is whack and not really intuitive on how to correct these issues.
If she's bought any enchanted gear or turned in quests early and thus received inferior leveled gear then she has been scammed. Very easy to see why Oblivion has so many backseat gamers.