There are only two possibilities, either the prince deliberately spread the news of his disappearance or someone is trying to lure you out of the palace. Either way, it is best to remain seated where you are. The prince cares about you and if it's got too dangerous his men should be available to save you," Eva said. Eva was aware that some man named Dark was trying to kidnap the princess. This was the same man that has sent her to the prince's bed. After all this incident how could she not know that someone was after the princess to get to the prince?
She already notice that the prince cared for her so she was certain that he will make plans to keep her safe.
"You are right, if things were so bad, One would have come to tell me," princess Ellen realized that Eva actually made a lot of sense but she could not help but wonder why she knew so much about the prince.