The latest revelation came Tuesday afternoon when police said the gunman set up cameras inside his hotel suite and in the hallway. She flew from Manila to Hong Kong on September 22 and then returned to Manila three days later on September 25.
Clark County Sheriff Joseph Lombardo told reporters Wednesday just after 9 a.m. local time that Danley would be questioned in the next half hour at the FBI's Los Angeles field office.
They also believe that Danley knew nothing of Paddock's plan, and that she was sent away so she can not interfere with his plan.
When asked if Ms Danley was a suspect the sheriff replied: 'Currently she is a person of interest'.More news: Blow for Chelsea as Alvaro Morata injury worse than first feared
The shooter rained machine gun fire down on the more than 20,000 attendees of the concert, with over 500 people suffering injuries in the resulting chaos.
The sisters, who were not identified by name and whose faces were blurred, added that Danley would willingly cooperate with investigators.
The Australian Associated Press reported that Danley was born in the Philippines and moved to Queensland in eastern Australia in the early 1980s.
Why did Stephen Paddock, a 64-year-old retired accountant, fire from his 32nd-floor hotel window into a crowd of 22,000 concertgoers in the heart of Las Vegas?
"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", one of the women told NBC's Australian partner, Channel 7.
Paddock ended Sunday night's shooting spree, the deadliest in modern US history, by killing himself.More news: Meghan McCain joins 'The View' as regular host
He had wired $100,000 to Danley in the Philippines last week, authorities in Manila said on Wednesday, citing the Federal Bureau of Investigation.
Two Nevada gun shops have confirmed that they sold firearms to Paddock in the past year and said he passed all required background checks.
Reynaldo Bustos, her brother, told ABC News that he spoke to his sister following the shooting.
Investigators have plenty of evidence but nothing yet that points to a motive in the shooting.
Paddock used Ms Danley's ID to check into the Mandalay Bay hotel before carrying out his deadly rampage. This investigation has not ended with the demise of Mr. Paddock.
Chris Sullivan, the owner of Mesquite's Guns & Guitars shop, issued a statement confirming that Paddock was a customer who cleared background checks and said his business was cooperating with investigators. They said they want people to know that social media has spun this out of control and jumped to conclusions that their father was involved.More news: Delta will allow text messages during a flight