Shard of Glass by Emily Deady

Once she was a noblewoman.
Now she is a palace servant.

Ashlin never pictured herself scrubbing floors. But with the family savings depleted and her stepmother crippled by grief, Ashlin selflessly takes a job at the royal palace. She can pursue her dreams of becoming a seamstress someday in the future.
However, as she forms an unlikely friendship with the prince, she learns that the future may not be so certain. Wielders of a powerful magic threaten their small coastal kingdom and Prince Onric does not believe that their defenses will hold.
As Ashlin navigates growing feelings for the charming prince, she realizes that her unique skills could help save the kingdom. But can she trust the charming prince or he is merely exploiting her selfless nature?