Sure. 'Hermione's Ascent' is a great fanfiction. It focuses on Hermione's journey to become extremely powerful. She studies under a mysterious wizard who teaches her ancient and powerful magic. And 'Super Hermione' is also quite interesting. Here, Hermione is born with an innate super - power in the wizarding world, which she has to learn to control and use for good.
There's 'Hermione Granger and the Time - Turner of Doom'. In this one, Hermione discovers a more powerful version of the Time - Turner and uses it to change the course of many events, showing her great power. Another is 'The Power of Hermione', where she has an accidental encounter with a magical force that supercharges her magical abilities.