[Alright... so... I sort of had to redo the entire story for the 'Daughter Starlight' series and it has taken a lot longer than I anticipated. But here it is! Brand new, fixed up, and closer to show canon! ... minus a few bumps. So thanks for being patient.]

Starlight Glimmer went to the past to destroy Twilight Sparkle's life and friends! Instead, she ended up becoming Twilight's daughter and Spike's sister. Now Starlight has to earn the trust of Twilight's friends as well as get in touch with old and new friends. Meanwhile, Spike has to explain what happened to him and Twilight in the past and Twilight struggles with her position of royalty.
There is much confusion and uncertainty in their future, but through the power of friendship they can triumph no matter when a problem occurs.