This story is a sequel to Daybreaker steals Twilight

After being abducted by Daybreaker, Twilight's memories of the wedding rehearsal were erased. Now her guilt ridden friends wish to forget about how they abandoned her as well. But they worry that Twilight will eventually remember what they did and not forgive them. Conflict emerges between them as they struggle whether to tell her the truth or not. Meanwhile, Twilight Velvet means to protect her children by any means necessary, and Celestia is having doubts about whether or not she should be ruler anymore.

This story is a sequel to Daybreaker vs Chrysalis

In the aftermath of the battle with the Changelings, everypony is feeling guilty for not heeding Twilight's warnings and hopes for a chance at redemption. But when Daybreaker suddenly returns and kidnaps Twilight, they're going to get a chance much sooner than they thought.

Instead of Celestia fighting Chrysalis first, Twilight does. After Twilight is defeated and poisoned from Chrysalis's bite, Celestia becomes filled with an uncontrollable rage that transforms her into Daybreaker. Once that happens she attacks Chrysalis. Will she be able to stop the changeling, and more importantly, will the heroes be able to get Celestia back as well as save Twilight's life?