Filled with rat holes

Yin Zhu's face turned pale as the kettle in her hands almost fell on the ground, it was with great patience and courage that she caught it and continued to stand as if she was unaffected by what Situ Zhilan told her just now. She knew that the three young masters were cursed, this was something that the entire mansion knew but no one was aware of their curse. 

So, does it mean that the woman whom they all loved was killed because of their curse? One that they were aware of? 

No, maybe Situ Zhilan was trying to play with her head, thought Yin Zhu but before she could ascertain that thought in her head, she heard Situ Zhilan's voice once again.