From These Ashes by Melisa R. Hightower

Scarred by the deaths of her family and the attack that left her fighting for her life, Aerika struggles to move beyond her grief. Hoping for a fresh start, she heads to an island retreat for rest and healing.
She finds neither. Arrested on arrival, Aerika is interrogated by an insane alien “Admiral” convinced she’s part of some otherworld rebellion.
When wild accusations are levelled against her family and secrets are revealed, Aerika finds herself thrust into the middle of a brutal war she doesn’t understand.
Now, Aerika must escape before the Admiral realizes she doesn’t have the answers he seeks and completes his mission: kill her.