It's extremely hard to come up with an answer to this question.
Maybe it's because he was a princely figure, and most girls in ऐनीमे seem to like that kind.
Maybe it's because she fell in प्यार with him the moment he saved her from the ravens.
Maybe it's because she was told that her father and Mytho were the only people who would प्यार her and she was grateful for the prince's "love".
But the guess that I favour is that, just like Ahiru, she was taken in द्वारा those gentle, lonely eyes and then fell deeper in प्यार with him from that point in.
