This story is an alternate sequel to "Nightmare Moon's Tiny Adversary", and "Celestia's Tiny Student", by CommanderX5, written with their permission. I recommend reading them, though it may or may not be "needed", per se, to understand this fic.
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After the defeat of Nightmare Moon and the return of Princess Luna, Twilight Sparkle has decided to stay in Ponyville to live in the Golden Oaks Library so as to be close to her friends. Tasked with studying the magic of Earth Ponies, she will let nothing stop her from succeeding in her task. With her dragon assistant, Spike, her faithful bodyguards, Overwatch and Steel Blade, and her new Ponyville friends by her side, she's ready to take on whatever challenges her new home may have to throw at her. How will these adventures impact Ponyville and its newest resident when said mare is one one-hundredth of her natural size?
Only time will tell.