Briar wasn't willing to keep that wild seed in her. The thought of raising a child from her rapist, Briar abhorred the child with a thought. As a result, she took some herbs after following Mammy Adonai. She knew several herbs. It's just that she nearly lost her life after aborting that wild seed.
It was then that Mammy Adonai finally knew what was happening to her. Briar remembered how sad and in pain Mammy Adonai was when she learnt of that.
However, she still helped her with the post-treatment however, a lot of damage had been done.
Because she was young and didn't know the measurements, Briar used too many herbs which damaged her womb.
Although Mammy Adonai later saved her, her womb was weakened. She could no longer carry a child to full term in the future. She would die if she did so.
Back then, because of her calling and how as a future spiritualist if she accepted her calling wouldn't need to marry or have children, and no more effort was put into treating her further.