This has a strangely lumpish look to it. The detailing present in other similar items I’ve seen is absent in this item. This is especially noticeable with the feet. All unquestionably vintage such items I’ve seen have slightly pointed heads, rather than the smooth one this item has. Overall, the molding looks primitive. Ask the seller lots of questions.
06/12 Update: This questionable items was included as part of a two-item lot. That lot sold for $125. I remain unconvinced as to its vintage nature.
08/25 Update: The same seller sold another one of these ghost dancers as part of a three-item lot on August 22 for $381, strengthening my belief that the dancer is not a vintage item.