Responses
I’ve read some of the raws and that’s not what happens at all. Yeah psyche is weak but she isn’t selfish. She was willing to throw away her love for the crown prince if Medea was chosen instead. However, she didn’t fully grasp how important being crown princess meant to Medea which is why she accepted the position. You can see in the future chapters that she honestly tries to help despite not being very good at it.
Theoreyically speaking. I'm feeling that Psyche being the weak-minded and selfish girl she was. Would refuse to switch back bodies with Medea later on. Based on the past events she has a knack for coveting things that is not hers to begin with. Like being the crown princess which was NOT duly deserved. And now being in Lady Medea's body I can see that she would want to keep that Powerful feeling, Lady Medea's Authority and even Falling in love with that silver-haired guy. In my opinion she's greedy like that.