She said she jumped up and ran outside, where she shouted "drop and roll, drop and roll" and Mr Singh told her to get some water. She then ran back inside to call triple zero, and grabbed a hose while she was on the phone calling an ambulance.

Mr Singh, 41, is on trial charged with the murder of Ms Kaur, 32, who died in hospital the day after the petrol-fuelled blaze, which caused burns to 90 per cent of her body.

Mr Singh has pleaded not guilty and says his wife lit herself while he was upstairs in their bedroom.

The jury of six men and six women was played vision of a walk-through Ms Valle did with police four days after the fire, where she recounted what she saw and did.

In the video, Ms Valle says she "flew out" of her house after she saw Ms Kaur covered in "really big" orange-red flames from the neck down.

"I said 'oh my god she's on fire'," Ms Valle said.

"I couldn't understand how her body and everything could be so engulfed in flames but not her face. I could see her face."

Ms Valle told police that officers arrived quickly and surrounded Ms Kaur on the bottom of the driveway. She then approached Mr Singh, who she described as pacing on the driveway before he sat down on some stones.

"He was talking in his language, then he was saying 'my life is ruined, my life is ruined'," Ms Valle said.

"He stood up, and I grabbed him and I said 'what happened, what happened. Did she catch on fire on the stove? What happened'?"

She said Mr Singh then spoke again in his language and told her, "I'm a good man, I just told her she needs to help out with the house more".

She said Mr Singh also said something like, "I didn't mean for this to happen".

The trial continues.