Monica Hughes’ 1985 Sandwriter is the first entry in her Sandwriter duology.
Princess Antia of Kamalant has led a pampered life. Her parents are dead (of an accident, it is said) but she has been carefully raised by King Rangor (her uncle) and Queen Sankath (her aunt). Her immediate retinue includes doting nurse Nan and tutor Eskoril (whom Antia finds most attractive). Her childhood has been pleasant.
Now the bill for that childhood has come due.