I don't really understand Slyphie in this story at all... Is it explained more in depth on why she decided to actually stay with that princess? I get that those people helped her a bit when the calamity happened (she helped them out more since she saved them from the monster as she was falling from the sky). When, Rudy and Eris was sent demon continent their first priority was to make it back home with the help of Ruijerd. However, she didn't even bother trying to get back home? What? She is also considerably strong in terms of their worlds magic of "normal" people... So, for her to submit to someone considerably normal in terms of strength and even power or putting herself in life threatening situations for a useless princess over going back home? Makes absolutely no sense..
Edit: I'm not referring to how she feels about the princess now.. I'm referring to back when right after the calamity happened.