Odd there don't seem to be a lot of options.
If you don't mind some conversion....
This medusa doesn't look too bad, if you can sculpt over her hair or give her a head swap.
Or buy some giant snake figures and some female figures, cut them in half, and glue a female torso atop the tail.
For example, here is a giant snake mini in Reaper Bones. It's plastic, so it would be easy to cut in half. Buy a female figure that looks right (Reaper has some nude figures if you want them to be unclothed, though I'm not sure they have any in the Bones line). For clothed Bones, something like this lady might work.
Thanks for the reply.Medusa would not work because Chinese females ,even evil ones dressed modestly .. Might try your suggestion and find a figure wearing a Hanfu or Kimono and cut and glue it onto a large snake.