Someone get her a shotgun, this prince needs a new face, and that country needs a wake-up call on what constitutes a healthy relationship.
If the crown princess candidate despises the crown prince that much, the crown prince might try to force a pregnancy in order to "force" the princess to stay, the princess will not view the child as legitimate and might treat it as if it was conceived via rape. Best case scenario, princess feels alienated from literally everyone for the rest of here life and takes it out on other by being difficult, worst case, she kills all her kids, her husband, and then herself, effectively ending the royal family.
Due to this risk, anyone with an IQ above the freezing point of water would suggest an intervention with the crown prince. Because that hasn't happened, I cannot foresee this kingdom's survival even before the crown prince become king, and good riddance I say to that.