The sister of the Filipina-Australian girlfriend of Las Vegas mass-killer Stephen Paddock says she was sent to the Philippines two weeks before the massacre so she couldn’t interfere with his plans.

Marilou Danley has arrived back in the US to face questions about the massacre and the money her boyfriend transferred to her in the Philippines before he killed 59 people and injured more than 500 as he fired from a 32nd floor casino hotel suite on Sunday night.

Ms Danley was taken through Los Angeles International Airport by FBI agents in a wheelchair on Tuesday night after flying in from the Philippines.

The 62-year-old former Queensland resident, who left Australia in 1989 and lived with Paddock in Nevada, will be escorted to Las Vegas.

“We have a lot of questions,” Las Vegas Undersheriff Kevin McMahill told reporters.

Her sister who lives in Queensland says she is a good person and knew nothing about Paddock’s plot to slaughter dozens of revellers at a country music festival on the Vegas Strip.

“I know that she don’t know anything as well like us. She was sent away. She was away so that she will be not there to interfere with what he’s planning,” her sister, whose name was not revealed, told the Seven Network.

“She didn’t even know that she was going to the Philippines until Steve said ‘Marilou I found you a cheap ticket to the Philippines’.

“He sent her away so that he can plan what he is planning without interruptions. In that sense, I thank him for sparing my sister’s life. But that won’t be to compensate the 59 peoples’ lives.

“No one can put the puzzles together. No one except Marilou. Because Steve is not here to talk anymore, only Marilou can maybe help.

“She probably was even more shocked than us because she is more closer to him than us. To be able to find out the person you love, and live with, can do such a thing and you thought you knew the person yourself.

“Marilou Danley is my sister, she is a good person and gentle soul. A mother, a grandmother, a sister, a friend.

Police at the scene of the shooting at the Mandalay Bay Hotel and Casino.

“He done this solely himself.

“Marilou seemed madly in love with Steve.

“Maybe if Marilou was there this maybe didn’t happen because she won’t let it happen. She would definitely stop whatever he was planning.”

Las Vegas Sheriff Joseph Lombardo hops Ms Danley can provide a “substantial amount” of information on Paddock’s motives.

Paddock, 64, who used a sledgehammer to smash holes in two thick glass windows of his Mandalay Bay hotel suite, used high-powered rifles modified to be automatic for the mass shooting.

Forty-seven firearms were found in three locations – Paddock’s hotel suite, the home he shared with Ms Danley 130km away in Mesquite and another property in Reno, Nevada.

Questions about Philippines money transfer

Authorities initially distanced Paddock’s murderous rampage from terrorism, but with the lack of a motive, Ms Danley’s presence in the Philippines and the money transfer, they refused to rule it out.

In the days before the shooting, Mr Paddock transferred $US100,000 ($A127,700) to the Philippines, a US official briefed by law enforcement told the Associated Press on the condition of anonymity.

“We haven’t absolutely ruled out anything in this investigation,” said Mr McMahill, when asked about a potential Philippines terrorism link.

He added the FBI has financial subpoenas to determine Paddock’s money movement, including whether $US100,000 did go to the Philippines.

“We have a lot of questions,” Undersheriff McMahill told reporters on Tuesday. “I can tell you that.”

Mr Paddock’s brother told media he would not be surprised if the money were for Ms Danley.

“The people he loved, he took care of and as he was descending into hell, he wanted to try and take care of her,” he said.

However, workers at the local Starbucks in Mr Paddock’s hometown of Mesquite, Nevada, painted a different picture of his relationship, telling the Los Angeles Times Mr Paddock would often berate Ms Danley in public.

“It happened a lot,” supervisor Esperanza Mendoza told the paper.

“He would glare down at her and say — with a mean attitude — ‘You don’t need my casino card for this. I’m paying for your drink, just like I’m paying for you’. Then she would softly say, ‘OK’ and step back behind him. He was so rude to her in front of us.”

Las Vegas Sheriff Joe Lombardo said he expected a “substantial amount” of information on Paddock’s motive would emerge in the next 48 hours.

Photos leaked to US media purporting to show Paddock’s room after he took his own life show guns and ammunition littering the floor. They also appeared to show a note left on a table.

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Police found 23 firearms in Mr Paddock’s suite and 19 at his home at a retirement community in Mesquite.

Investigators also found explosives in his home and ammonium nitrate (used as a bomb ingredient) in his car.

Footage from inside the hotel also revealed Mr Paddock had set up a camera on what appeared to be a room service cart in the hotel hallway to warn him when police were getting close.

-with ABC, AAP