Sophia had anyway admired Lucia's unhealthy obsession she honestly didn't think Lucia would go as far as to kill somebody for her, she knew it was Lucia who did the murder when she noticed a guy following her and suddenly him disappearing only to see him as missing on the news at that moment of realizing what Lucia was capable of she couldn't help but start to have an uncontrollable laugh realizing how deep in this situation she was though Sophia wasn't upset she was actually a bit happy after finding out.
After Sophia realized what she was capable of causing Lucia to do she wanted to go deeper into the heart of Lucia just to see how much damage she could do before putting back up her innocent act it seemed impossible for anybody to see past the wall Sophia had put up to disguise herself she knew what she was doing, and she enjoyed it seeing the suffering of people close to her or seeing the suffering of others she deemed unimportant but despite everything she knows she's doing she wants to keep Lucia close to her Sophia wants to make sure she keeps Lucia as her own and let nobody else ruin the relationship between them.
79