Although Ji Xiaoxiao was an inner demon, she did not produce negative emotions. In other words, she was a combination of Ji Ruo's negative emotions and obsessions. Of course, she could not rely on herself to become stronger.
After all, Ji Ruo was the main body.
Even if it was an inner demon, it had to abide by the law of conservation of energy unless Ji Ruo's obsession deepened or a new obsession was born. But how could obsession deepen or be born so easily?
If Chen Mo hadn't materialized it, the inner demon would have been dormant for a long time and would have suddenly erupted at a certain moment, turning one into a mad martial artist.
However, since it had been materialized, it would be difficult for the inner demon to continue to grow stronger. This referred to the obsession that formed the inner demon, not the strength of the inner demon.