FanficRecs proceed, but beware of seemingly random OC
It's a good story. The writing is a little too rushed for my taste, but on the plus side, this means that the plot advances quickly thanks to Ginny doing her best to waste no time, and the action scenes are actually fun and engaging.
The only real maybe-downside-maybe-not to this story is the seemingly only tangentially connected side-story of a Muggle boy who got super powers thanks to (?) the energy released by Ginny's time-travel and who is now convinced that he should be a superhero.
The author insists that there is a good reason for the side-story, that it is necessary for the main premise, and that this will make perfect sense later on. So far, though, you could separate both stories and nothing would be lost.
As the story stands now (fourteen chapters uploaded as I'm writing this), I hesitate to recommend this fanfiction unless you have a lot of patience and really don't mind Original Characters doing their own thing alongside the main story.
FanficRecs Moving comments to reviews
Anon: Determinator!Ginny doesn't mess around. Not even a full year into the new timeline and events are already unrecognizable. The Stations of the Canon and In Spite of a Nail are averted in this one. Ginny is, without acting strange, such a good friend to Harry that he's noticeably more emotionally healthy. Her extreme proactiveness results in completely nullifying Chamber of Secrets's main conflict without taking the drama or suspense out of the story.
Anon: Has an OC that annoyed me. Shows up and takes up sizable chunks of chapters. Ended up dropping the story at around chapter 8 without fully understanding why the author bothered to write in the OC.