@jespah,
Jespah is right.
"the artist is the child that survived adulthood" I do not remember where i read this.
It is not strange for a prebubecent teen to still have imaginary friends. Even adults can have sometimes.
They become problematic when she becomes delutional. I mean:
<if interferes with interpersonal relationships
<if interferes with sleep patterns
<if interferes with responsabilities (school grades, work, etc)
<starts confouding reality and imagination
<becames paranoical
<detect an important change in personality
Anyone can have an imaginary friend, It is normal to talk to ourself too. I remeber a funny quote:
Hearing voices: normal
Arguing with voices: normal
Loosing the argument: problem