I was asking who she was, and my friend asked contacts in the Barbie world and they came up with this explanation, that I totally buy:
Mattel factory Malaysia are producing Mattel's repro dolls and they have an outlet store and they are selling the unused or defective heads and accessories on there.
Ali-express and some other people got these repros and other dolls accessories from there.
I read from doll Gaul in Instagram it's a repro factory head that never got rooted, they're quite a catch.
Looks like the 2014 ponytail reproduction, the scalp color usually indicates the color of hair the doll will have.
One more comment from the helpful collector is: I see these coming out of China.
Thank you who ever you are for the great help!
I only have repro Color Magic doll so I can't really take a good look at the scalp, but on the lower neck it says Mattel 1958 like on this head.