Everything had not returned to normal even if Queen Everlin had helped Frederica to return to her normal self.
Right after Queen Everlin's soul left Levan's body and entered Frederica's body, Frederica could blink her eyes normally, and she could even move her body as her brain told her to. Not only that, but she was also able to speak again, and the first question she asked was: "What happened to me?"
Of course, it was King Gerold's job to explain everything to the blonde Princess, and the King carefully did the job until the Princess could understand the situation better.
King Gerold honestly told the Princess about what had happened to her, saying that Levan was the one who punished her for her bad behavior in the past and that Levan's grandmother had helped her return to normal.