So I'm writing a story that features a highly speculative Neanderthal society, and the protagonist is a trans woman. (Specifically, a priestess, not unlike those in Mesopotamian or Scythian cultures.) What I'm wondering is, is there any plausible source of feminizing HRT that would be available to her? I know that some herbs have anti-androgen properties; the sticking point would seem to be estrogen, since getting animal estrogen is a lot more difficult in the absence of livestock culture. There is technically magic in this setting, so I could invoke that if necessary, but I'd prefer to use a medical approach, if possible. Are there any options that would actually be feasible for a hunter-gather society?
Edit 1: HRT is hormone replacement therapy. So feminizing HRT would be HRT that changes the body's hormone regime to an estrogen-dominated one.
Edit 2: I'm pretty sure most cultures that are trans-accepting have had HRT of some kind. The modern stuff is a lot more sophisticated than the traditional approaches to it, but it's still all HRT. The issue is, estrogen is generally derived from animal sources.
Edit 3: Honestly, I'd like to know if there's some real life approach that would work. That's what I'm asking, if anyone knows of one. Such as a way to extract animal estrogen that would be feasible for hunter-gatherers, given that the traditional means seems like it would be impractical without domesticated horses.