We are talking about human remains here.

If this was the skin of your grandmother’s grandmother, how would your grandmother feel about it being used a hazing ritual?

Using the balance of probabilities it is likely that the unidentified person’s family would not want that to happen and is likely they would want their grandmother back.

This being a woman is only relevant because, in that era it was more likely to be a woman, I.e. consent was not seen as important when do things to/with women’s bodies.