One Magic - April C Royer - Bog

Her greatest strength, and weightiest burden, are her own selfless heart.
Morgan is now Queen and Caretaker of Chemerie, mother to powerful twin children, and charged with many daunting tasks. Her most significant challenges are to ensure the survival of her fast-maturing children, restore the precious connection once felt between her human and dragon brethren, rebuild a lost portal, and teach those ignorant of their magic to wield it responsibly. Any one of these could prove fatal were she to face it alone.
Her brother has found his mate at last. However, the woman's uncontrolled magic puts both of their lives at risk. Morgan tries to help but soon finds herself stranded on a distant planet after an attack born of ancient hatred destroys the portal home. Returning to her family requires navigating a world ruled by a ruthless warlord wielding dark magic stronger than any she has yet faced.
Though powerful and skilled with magic, Morgan is still vulnerable, imperfect, and in no way, invincible. To survive the coming storm, she must redefine what it means to be strong, to see that offering one's own life can be as selfish as it is selfless if the true cost is not considered.