¨... and remember the sound of the swan´s feet as she ran around the lake beside me.¨ is one example it's on page 116 in chapter 23. This is an example of when Isla has a memory about the swans. The conflict that happened between her and the swans is that she and her dad go to see them every year, but this year her dad is sick but he goes anyway. Three swans die due to power lines, but the rest is migrating elsewhere. They lose the swans, but while driving they spot them again. They get out of the car and while chasing them her dad has a heart attack. The theme might be, if you know
it's not right don't do it. I think that could be it because he knew he could get hurt but he went anyway. He could have killed himself by doing that he wasn't stable for a while so that was risky. This is person VS himself.
This could be a message about life or family. I can tell because Isla loves her family and in life you shouldn't go around just chasing swans, you could really get hurt or worse.