The only enemy of the Zhang's that she was aware of was Caishen's ex-girlfriend and even then, wasn't it too much to assume that she would harm Zhang Sensen, the second elder just to hurt Caishen?
If she was aiming for him, for whatever reason, there were other people she could attack like his grandparents, parents and siblings.
"So what is worry about the poison? Do you think there are aliens from that world living on earth?"
"I have many theories right now that i am not willing to share without further investigation. From now on, I am going to scour your internet and the Zhang family's monitoring team to catch what they missed. I will find the person that poisoned him and then we can see which of my theories is correct."