Authorities said Paddock, who had no criminal record, smashed windows in his hotel room shortly after 10pm on Sunday and rained fire on a crowd of some 22,000 attending a country music concert below.
One sister told Seven News said that Danley didn't know anything ahead of the shooting.
Authorities in Manila, citing the US Federal Bureau of Investigation, said Paddock had transferred US$100,000 to Danley in the Philippines.
"The FBI has coordinated with the Philippine office of the Interpol to look for her", NBI spokesman Nick Suarez told AFP. One passenger said she overheard members of the flight crew saying that one of them had escorted Danley from the plane.
"We have not located her at this time and we are interested in talking to her for follow up". Authorities reportedly found 23 weapons in 64-year-old shooter Stephen Paddock's Mandalay Bay hotel suite, to which he'd arrived by vehicle.
According to law enforcement sources, Paddock has sent tens of thousands of dollars to someone in the Philippines in recent months.
Investigators also found a computer and 23 guns with him at the hotel, along with 12 "bump stock" devices that can enable a rifle to fire continuously, like an automatic weapon.
What kind of relationship did the pair have?
While Waltrip did not explain why her father and Marilou separated, she did reiterate that Marilou was a "good person". Read what they had to say below. She once worked at the Atlantis Casino Resort and Spa in Reno, which said Danley left the company "several years ago".
What is the latest in the investigation?
'We are making progress, ' the sheriff said in determining Paddock's motive.
In the Seven News interview, one sister said Danley would willingly answer investigators' questions. The Associated Press put the death toll at 59.
Clark County Sheriff Joseph Lombardo told reporters: "It was pre-planned extensively and I'm pretty sure he evaluated everything he did in his actions". He has branded Paddock a "demented man".
According to Ms. Danley's sisters, who spoke to CNN-affiliate Australia 7 News on the condition of anonymity, Paddock had sent her away prior to the massacre.
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Las Vegas police's Joe Lombardo also said that police uncovered explosives and 1,000s of rounds of ammunition at Paddock's home. A Philippines immigration spokeswoman said Danley arrived in the Philippines on September 25 on a flight from Hong Kong.
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