Link to Adcoons story: http://www.fimfiction.net/story/39954/mare-in-the-mirror
This is an unofficial sequel to adcoon's story the Mare in the Mirror. if need be, I'll link his story so you can read it and see why i loved it so much, that I'm willing to try my hand at paying tribute to it. Heck, I think it would be great someday if someone like LostNarrator or Scribbler found that gem and did a fic reading of it.
Trixie is still seeing Twilight's ghost in the mirrors of Canterlot and in Ponyville. It had been a year since the events that had taken place in the Capitol, and she still couldn't forgive herself for what she had forced Celestia to do. They had forgiven her for it, but she still held out that there was a way to bring Twilight back into her life, into her friends lives.
She just wasn't sure of it till now. Was the void going to let her go, or would there be a price to pay for it all to come to fruition. She had to try, every fiber in her being demanded it. She had fallen in love with Twilight after the Magic Duel incident involving the ALicorn Amulet. This would be Trixie's way of cementing that love after everything they had been through. She owed it to her to try.

There was also a warning to adhere to if it failed: Stare into the Abyss for too long, and it will Consume you.