I'll likely update this as I find more songs since I suck at picking songs for characters.

"I'm Still Standing" by Elton John - You could say it's a song that Coco would sing to her strict parents due to the fact that she's gotten stronger since she gained independence from them. (Granted, she would try to make peace with them first due to that dream thanks to Woona, but it's unlikely she will be able to succeed there).