What she said was not wrong, but it could lead to misunderstandings among the spectators and Official Liu, who may think that the two sisters had initially agreed to distort the truth under the coercion of Duke of Qi's residence.
Then, upon arriving in court and hearing Official Liu say that giving false testimony could lead to imprisonment, they changed their minds and decided to tell the truth.
Indeed this is...
Zhu Jiao also realized she misspoke at this moment, but the more she explained, the more suspicious it looked, as if she was trying to cover up the truth. Therefore, she could only clench her teeth in frustration and listen to what else the sisters had to say.
The two sisters were so shocked by Zhu Jiao's sudden outburst that their heads bowed and trembled pitifully, unable to utter a word.