C231 Question

Gu Weiwei almost lost control of the steering wheel. Why did Gu Linxi want to ask this question to herself all of a sudden? Gu Wei didn't reveal an expression of utter panic. She was only thinking about why Gu Lin Xi would ask him that. Could she be suspecting something? Or did Gu Linxi discover something? After all, back then when Xie Si Er and she had gone to Gu Lin Xi's house