Broken Shards of Time by Nyah Nichol

Wren must travel to the future to stop an authoritarian from destroying society. The person threatening everyone? Wren (future Wren, actually). Now, logic (if logic can truly be applied to plot devices of time travel stories) would usually dictate that one should travel to the past to stop someone from becoming evil in the first place. Not so this time. 

Wren survived a serious accident, that killed her parents, only by integrating robotic elements into her body. She grew up in the secret government lab where her uncle was building a time machine. His influence on her was immeasurable, so after his death she took up his work. The idea of time travel and a mysterious stone he left her caused Wren to become powerful enough to control the lives of others. 

Three people connected to the facility make it their mission to build a new time machine so past Wren can stop future Wren. Their backgrounds and motivations are revealed through sections of the story that focus on their perspectives. 

This relatively brief story packs a lot of sci-fi tech into it. More than just a time machine is necessary to complete the mission. So cool machines, lots of action, another 'evil' person. Good stuff. 

For more info, check out the Indianapolis Public Library catalog.