At a news conference Tuesday, Clark County Sheriff Joe Lombardo said police consideres her a "person of interest".
The official said Paddock visited the Philippines in 2013 and 2014, staying for five to six days on both occasions.
"Steve expected people to wait on him for the most part".
A woman believed to be Stephen Paddock's girlfriend, Marilou Danley, formerly lived in Springdale. A profile of Danley put together on Everipedia, a Wikipedia-style site with much looser guidelines and moderation.
The girlfriend of Stephen Paddock has returned to the United States - whisked through customs in a wheelchair - to be questioned by officers desperately hoping she can provide an insight into what led him to carry out his act of mass slaughter.
Snyder said 12 of the guns found in the hotel room were fitted with bump-stock devices allowing the guns to be fired nearly as though they were automatic weapons.
"She had nothing to do with this psycho", said a man who answered the phone at a number connected to Danley's friend who was named as a witness in Danley's 2015 divorce.
Paddock shot and killed himself before police busted into his hotel room. While she was there, Paddock wired $100,000 to an account under her name.
The girlfriend of Las Vegas gunman Stephen Paddock has been questioned by the Federal Bureau of Investigation.
Danley lived with Paddock in Mesquite, Nevada, northeast of Las Vegas.
The other sister said Danley, who arrived late Tuesday in Los Angeles from the Philippines, "didn't even know that she was going to the Philippines, until Steve said, 'Marilou, I found you a cheap ticket to the Philippines'".
"She probably was even (more) shocked than us because she is more close to him than us", the sister said. Paddock is accused of opening fire from a room at the Mandalay Bay Hotel Casino onto a country music festival, killing 59 people and injuring 527 people.
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His wife Brittany, who is expecting their son next month said , "We are safe-our angels were definitely watching over us tonight". They're pretty shook up. "I wondered if somebody had rigged up machines that were shooting these bullets", Eastwood said.
Amit Shah lambasts CPI-M, Kerala CM for murder politics
Meanwhile, BJP leader Vijay Goel has said that Kerala Chief Minister Pinarayi Vijayan is promoting violence in the state. The on-foot rally will travel across the state, traversing 11 districts and end at Thiruvananthapuram on October 17.