This made me giggle (not at you!) because after writing my post, I found myself wondering, “Did her doctor say why her estrogen was so high?”
If you knew that, then the real solution would be to heal whatever it was that was causing her estrogen levels to be so high. Then her system could then regulate itself.
I would still be guided by her doctor’s knowledge, but I think Endocrine System Rejuvenation (thread) could be safe option here.