She can help with divination, recognizing and utilizing fear, understanding the shadow of the external world and how it is incorporated within you as an individual, and in general opening yourself up to being a creature of nature as opposed to being outside of it like our species likes to define ourselves. I actually have quite a bit of my workings with her in my recent journal posts if you want to take a look at it.
As far as offerings go, chocolate is a BIG one. Also, music, wine/fruity beer, meat, and pretty much anything you wish to give out of sincerity.