The burden of myself
Has grown impossible to bear
Although rather than slip further
Down this mountain of despair
I will simply cry for help
And hope an angel hears my plea
Or I’ll not survive much longer
And succumb to misery.
If you haven't dealt with what Plath or this woman has, or are some credentialed authority on early childhood development of exceptional children (or poetry), I can't understand why your speculation on this is worth listening to.
For comparison, here is the "complex poetry" Plath had published at age 8 (titled simply, "Poem"):
"Hear the crickets chirping
In the dewy grass.
Bright little fireflies
Twinkle as they pass."