Crown prosecutor Natalie Walker this morning questioned the defendant's actions on the night of the alleged murder.
When asked about Gurjinder Singh, Kaur said: "He's quite emotional and gets angry quite quickly."
She previously told the jury she put a complete end to the affair on August 6, to which he reacted with frustration.
But why did Kaur not warn her husband when Gurjinder Singh pulled up behind them on Norman Spencer Drive on the night of the death, Ms Walker asked.
"You didn't say to your husband 'start the car, let's go'," the prosecutor said.
Kaur said there was not enough time to do so.
While Gurjinder Singh spoke to Davender Singh through the open window of his car, she played on her phone, she told the court.
"Even if this was a so-called angry and emotional man who had planned to kill your husband?" Ms Walker asked.
"He was talking to Davender and I had no cause to interfere," Kaur said..
The Crown rubbished her version of events -- that a 45-minute conversation and a trip to a Takanini Sikh temple had resulted in reconciliation between the married couple.
Ms Walker pointed to calls from Davender Singh to Kaur while she was at work, sometimes as many as 17 a day, which the prosecutor said were her husband "checking up" on her.
The calls came with the same regularity even after the supposed make-up, she suggested.
Cell-phone records were also scrutinised this morning.
The prosecutor said they showed Kaur's evidence that she called Gurjinder Singh's wife hours before the alleged murder, was a untrue.
"Just like the police interviews; you tell one story, they give you some evidence that was a lie and you change," Ms Walker said.
After cross-examination the Crown will close its case.
The trial is expected to end this week.