Once Upon a Silver Strand. Enchanted Realms, #1.2

A girl with hair spun from starlight. A fallen guardian bound to a shattered realm. And a tower that was never meant to protect her. High above the mortal world, Ariadne lives alone in a tower touched by the stars. Her silver hair, glowing with ancient magic, is said to be cursed-never to be cut, never to be touched. But when a celestial storm rains fire across the sky, a stranger crashes into her world.
Cassian is a guardian from a forgotten realm, drawn by a prophecy and the shimmering strands that hold the key to awakening long-buried power. As Ariadne's magic begins to stir, the truth unravels-she is not cursed, but chosen, a living bridge to the lost kingdom of Starna. And the tower that binds her is not a sanctuary, but a prison built to contain the magic threatening to tear the realms apart With the stars falling and darkness rising, Ariadne must decide whether to sever her past.
or embrace the magic woven into her very soul. If you love quiet heroines discovering untold power, brooding guardians with hidden hearts, and towers hiding secrets written in the stars-you'll love this Rapunzel reimagining.