Q:

" had been about everything and done almost every where"

What does this sentence mean in text below:
" there was a girl. She wandered all over the country hitching rides and shacking up until she'd been just about everything and done almost everywhere".

A:

This is an inversion of the normal phrase "done just about everything and been almost everywhere". This inversion is done for emphasis.
In a similar vein, one of my former colleagues used to say, "The early worm catches the bird."
The "normal" sequence will make a point but not catch anyone's attention. Bu the "inverted" sequence will raise eyebrows. When people get over their surprise, they'll remember the underlying point better (the one to which these phrases refer.)

