The Sin Eater's Daughter by Melinda Salisbury

Twylla has lived a sheltered life and that is a lonely life and isolated.  Now she has the attention of two suitors.  Her guard and her prince.    Oh when the secrets come out she faces the threat of death.

It's a page turner.  Lots of romance.  Not a strong character as she is naive.  The queen is the one who is strong.  Watch out for the dangerous queen.  Enjoy!