This painting depicts a number of symbols from various cultures. It was shown at a Paris exhibition in 1883, and I suspect the painting is more imagination than an accurate depiction of any sorceress. That said, the subject holds a staff with a symbol on top. The closest I have found is a "Pagan symbol of Summer" shown on this site, which grouped it among other symbols that appear to be western European.
Is that the symbol used in the painting? If so, why did the artist use a Pagan symbol, if he wanted to affect a non-European vibe?