wait, so psyche has the ability to heal, but the ability comes with her soul not her body, so psyche!Medea wasn't able to heal her wounds. Yialos gave psyche!Medea the necklace to take away her healing power, but it didn't work since psyche!Medea didn't have psyche's healing power in the first place. So then, when medea!Psyche arrives, she uses her power to heal psyche!Medea.
That reveal that only members of the royal family have the healing power... That's bad news for Medea's intentions