Luna banishing the corrupted Celestia? Trixie leading an alternate Mane Six? Sounds like a recipe for horrible bashfic!
Except it is not.
Sure, the canon Mane Six are often antagonistic, but that just shows the author's mastery. It is easy to see how extrapolating from their canon personalities leads to how they act.
Trixie is still boastful and often insensitive, but it is finely nuanced. You will sympathise with her. You will see how the shoe's like when it's on the other foot.