Actually, Dylan didn't get round to writing Hattie Carroll until six months after the killing, which he'd probably seen reported soon after it happened. We have the clipping he worked from - it was reproduced in Broadside - and it's clear from that that he introduced some factual errors which were entirely his own.

As for accurate biographical info on Hattie Carroll, why my essay is stuffed with it! See the link at the top of this thread.