That sanni hair looks really straight compared to your picture.
Arlene hairstyle looks a bit similar but hair parting on arlene is at the center compared to this picture where its slightly on the side so its not that one either but its quite close. https://zonegfx.com/arlene-hair-for-genesis-3-and-8-females/
Hmmm. I don't think either are correct. You're right, sanni hair is too straight and the arlene hair has a part down the middle instead of off to the side.