Besides her beauty appearance, a trait the woman shared with her daughter, even if she has a yin type body constitution, in the state in which her body is, she won't bring any benefits to a Heavenly Realm cultivator.
So, what Aster didn't understand is why hasn't the one who used the Bone Melting Palm on her, finished her off, the guy even took the risk of Alexandra's mother somehow recovering and taking revenge over the "death" of her husband, probably with the hope that she will end up coming to him, to stop the continuous torture, which evidently didn't happen.
But then Lilia's voice helped Aster solve that question, she who was hugging Aster from behind, and rested her chest on her son's head, carelessly said.
"Silk Consort yin constitution, now that is something you don't see every day".