"It's my evidence I was there by myself," the teacher said.
"He clearly knows exactly what goes on in that hotel more than I do. I have no knowledge about how and why he'd know about that."
Mr La Hood suggested the boy knew because he was there having sex with the teacher.
She denied that.
"Even if he was there with me, how would he know about the main motel? I don't even know about that," she said.
"He wasn't there with me so I don't know how he knows that exact layout of that motel."
The teacher, whose name is suppressed, is on trial facing charges of doing indecent acts, unlawful sexual connection and sexual violation.
She is accused of kissing the boy and having oral sex between 2011 and 2014, in the northern Wellington suburb of Porirua, as well as the one instance of sexual intercourse.
The boy has also told the court how the teacher made him hide under a tarpaulin in the back of her truck so the teacher's mother wouldn't see him at the motel.
The teacher said that wasn't true and she took her car to the motel. She hadn't thought about whether it was possible for the boy to have hidden in such a way.
"It wasn't on my agenda to stuff a boy under a tarpaulin. It would be inhumane."
Mr La Hood said it would be particularly inhumane if it was to avoid the boy being seen at a motel so the teacher could have sex with him.
"That didn't happen," she said.
The teacher said she was told by "a number of adults -- basically anyone that came into contact with [him]" that the boy appeared to have an infatuation with her.
At one stage the teacher found out the boy had told others his age the pair had sex.
Mr La Hood asked why she didn't tell anyone about that. The teacher said she was concerned for the boy but had eventually mentioned it to a teaching colleague, a claim Mr La Hood questioned.
The trial is expected to finish this week.