I always liked Sylgja's personality and dialogue too but REALLY didn't like the way she looked either so I improved her as well as Ysolda. This is to my personal tastes of course but seeing as I had one request to release this as a mod in the comments of my Ysolda Improved mod, I will just go ahead and release this as a way to pay it forward for all of the times I have requested things and got them.
Check out my other mods...
Ysolda Improved
Lydia marriage fixed and more

image explanations
Sylgja with different hair, wench outfit and no freakin' lame pickaxe lol.
second is Sylgja with a blonde nord braid and no pickaxe as well as being essential to avoid the mine bug.

Requirements....
This uses all vanilla items as a base so you can use it without these mods but she will look different. (and not as good IMHO)
I use Bella's better females mod with either makeup version 1 or less makeup...I can't remember which but the makeup is lightly applied. Use your own makeup version or hot chick mod or leave her vanilla if you want. I would love to see screenies of what she looks like without the required mods installed or with different mods installed like Cover Women which is also very savory.
CBBE nevernude mod which is not really necessary with this wench outfit unless you want the clean skin textures.

Installation....
choose just one version. (in case I release others) they will over write each other.
just unzip the file using 7-Zip to a temp folder and drop the contents into your data folder and let it over write. Then go into your launcher, select data files and tic the Sylgja.esp or activate it in whatever MM you might be using. I don't download with NMM so if the file structure I am using doesn't work for that, PM me with how the file structure should be and I will upload a NMM version.

Uninstallation....
delete the Sylgja.esp out of your data folder and the 000c3a3f file out of your data\meshes\actors\character\facegendata\facegeom\skyrim.esm folder.