Time Walker — Meghan Ciana Doidge

Beth was sneaky. No lock could hold her. No cage could confine her. No door could bar her way. But, when your adoptive mother is a Spirit Binder, and all your siblings are elementals, being sneaky doesn't really rank.
 
That is until the devastation of a city draws her omniscient mother's attention, and her siblings go missing one by one, then Beth's sneakiness is the only thing standing between her, her loved ones, and the worst enemy she'll ever face: herself.

--------------
 
Time Walker is a 50,000-word young adult fantasy novel filled with magic, angst, and a kiss of romance. Loyalty and the bond between siblings, whether blood-related or not, is the backbone of this coming of age tale set a thousand years after spirit (aka magic) rises to take back the world in an apocalyptic event. It is the first book in the Spirit Bound series.
 
Written by Meghan Ciana Doidge (After The Virus, Spirit Binder) the novel begins ten years after the events of Spirit Binder, and though it's not necessary to read Spirit Binder before reading Time Walker it may give some extra background to the world and adult characters. Spirit Binder is written for a mature young adult or adult audience.