If this incident had only targeted her, she wouldn't have needed to fear at all.
The problem was that Cai Yiren and Qin Zhizha's target was actually Qin Zhiyou behind her. Everything they did could have a fatal impact on Qin Zhiyou. Moreover, Cai Yiren's targeting of her wasn't a one-time thing. She had to return to the Qin Family and face her at all times.
Truthfully, unless she never returned to the old mansion and never interacted with Cai Yiren again, this situation would be unbearable not just for herself but for Qin Zhiyou as well.
