How about "Look At Her Now" by LeahLillith? It's a waist-long french braid in the back.
Here's the original: https://www.thesimsresource.com/downloads/details/category/sims3-hair-hairstyles-female/title/leahlillith-look-at-her-now-hair/id/1468932/
But I think the retexture looks better:
https://ifcasims.tumblr.com/tagged/retextures/page/7
It's on Page 7 now, but might that might change when she adds more stuff to the site, and there is another version on page 9 (at the moment), that was converted from the TS4 version.