The shots started at 10:08 p.m. and the gunfire stopped at 10:19 p.m., the shooting went off and on for nine to 11 minutes, CNN quoted Clark County Undersheriff Kevin McMahill as saying.
The FBI agents will pose two critical questions to Danley: Did she have any idea about what motivated him, and did she have any knowledge of what was about to take place and not alert authorities?
She goes on to say that Paddock was a "kind, caring, quiet man" and hoped for a future with him.
"I am devastated by the deaths and injuries that occurred and my prayers go out to the victims and their families and all of those who have been hurt by these terrible events", Ms Danley said.
"I voluntarily flew back to America because I know the Federal Bureau of Investigation and Las Vegas police department wanted to talk to me and I wanted to talk to them", her statement said, according to Newsweek.
Stephen Paddock, the gunman who killed 59 people and injured more than 500 in Las Vegas on Sunday, set up a number of cameras in and around his hotel suite, police said. While she was there, Paddock wired $100,000 to an account under her name.
News first reported the wire transfer, citing "multiple senior law enforcement officials", and CNN later confirmed it with another official.
"A mother, a grandmother, a sister, a friend", she said of Danley.
Prior to the Sunday night shooting, Paddock bought his girlfriend a ticket to the Philippines so that she could visit her family. "No one except Marilou".
Knights, 23, who lives near Brisbane in Queensland, told Australia's Channel 9 that he spent time in Las Vegas with Paddock and Danley a few months ago. "Because Steve is not here to talk anymore, only Marilou can maybe help out".
Ms Danley, who has not been arrested, lived with the 64-year-old at his retirement community home in Mesquite, Nevada - and officials searching the property have found a number of weapons.