"...I could have driven Eleven out of West Shadow a long time ago, before you came back. Why would I wait until after your return to do these things?"
Exactly!
The whole reason she never confronted Fang Eleven was the fear that if the matter came to light and Jin Xiangbei found out, their relationship would likely be over.
She originally thought that after all these years, as long as Fang Eleven didn't appear in front of him, he would one day forget her, but...
"Yes, however, you never told me that Eleven was also in West Shadow."
Yao Ruoshui tensed up at this.
He thought that Fang Eleven had disappeared, had left, but he didn't expect that she never left, but stayed in Xicheng instead.
She never told Jin Xiangbei, who was in the United States, that Fang Eleven was in West Shadow!
She knew that if he found out Eleven was still here, he would immediately fly back to the country. How could she possibly tell him?
