Marilou Danley, 62, was met at Los Angeles International Airport by Federal Bureau of Investigation agents on Tuesday night after flying from Manila, multiple media outlets reported.
Ms Danley's Australia-based sisters believe Paddock sent her away to prevent her from interfering with his plans.
In order to know the motive which turned a man with no criminal history into a mass murderer, the authority talked to gunman's girlfriend.
She's being described as a "person of interest" in the case. "We stand together to help you carry your pain", Trump said.
Eric Paddock, 55, said he is offering an exclusive interview about his late brother to a national news organization in return for the money.
Lombardo said that Paddock fired the first shots at 10:05 p.m. PT, and the last shots at 10:15 p.m.
Stephen Paddock, 64, turned a gun on himself on Sunday after firing hundreds of bullets into the crowd gathered for the final night of the Route 91 Harvest music festival, killing almost 60 people and wounding hundreds.
While we don't know if Paddock ever checked into any of the rooms, it's clear that things could have been disastrous if he had made a decision to attack people at the event. He had devices attached to 12 semiautomatic rifles that allowed them to mimic fully automatic gunfire.
The retiree sprayed bullets into a crowd attending a country music festival from his hotel room at the Mandalay Bay Hotel, before apparently killing himself.
Police have said they found 23 guns in Paddock's room at the hotel.
Investigators questioned her about Paddock's weapons purchases, a $100,000 wire transfer to a Philippine bank that they think may have been intended for her, and about whether she saw any changes in his behavior before she left the United States. He said at the time that they had information that Paddock may have attended Life is handsome.
Video shows the Las Vegas hotel suite from which Stephen Paddock unleashed a firestorm on concertgoers.
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