Sharon Tate was murdered as a sacrifice. That line could refer to her.
If I remember correctly from the book about the murder they tried to cut her open to get to her child, she was far along in her pregnancy
From Susan Atkins testimony:
But that night I met Charlie in that house on Lime Street, I had no idea I would be there when God’s game ended for Sharon Tate, with me holding her in my arms.
And when it was all over, I didn’t want to go back in that house but something made me go. I went over to Sharon Tate, and I flashed, wow, there’s a living being in there. I wanted to, but I couldn’t bring myself to cut her open and take the baby. I knew it was living, I knew it wouldn’t live…