This figurine has been fashioned around a hollow-core. The technique known as surikeshi jomon (“partially erased cord-marks”) has been used at the shoulders and waist. Figurines representing women are usually found broken into fragments when first discovered. This figure was found nearly intact. It is a rare example of a figurine that had been carefully enshrined as part of a stone assemblage. 
Object label 

This type of Jōmon-period dogū, or clay figurine, is described as having “goggle eyes,” as the eyes of these figurines are depicted in such a way that they appear to be wearing goggles. Its navel opens to an inner cavity. Dogū tend to be in fragments when they are discovered during excavations; this one was miraculously found largely in one piece, having been buried with care in the middle of an assemblage of stone objects, laid on its side.
 
NAKAGAWA AyaEnglish by Mary Lewine 
Buddhist Art Paradise: Jewels of the Nara National Museum. Nara National Museum, 2021.7, p.329, no.235.