...went to a foreign country and stays in the world of the creators as a normal human.
According to both Japanese Wikipedia and Pixiv Dictionary (Japanese):
After that, she left the venue without seeing the end of the Elimination Chamber Festival and went on a journey to a foreign country.
Unlike the other creations, there is no scene of what happens after the festival, but according to Rei Hiroe, she loses her powers just like Meteora.
In the last episode (episode 22), there is no scene of her returning to her original fictional world through the gate deployed by Meteora.
This made her one of the few creations who remained in the real world.
However, according to Rei Hiroe, "She eventually loses her abilities just like Meteora. In other words, she becomes a normal human being."
(Unfortunately, I couldn't find the original source for Rei Hiroe's statement)