The woman told the BBC she was working in a building housing the British Authority's offices in Los Angeles when the incident occurred in 2019, and that Brand spoke about the subject sarcastically shortly after on his radio programme.
"I'm ashamed, but more importantly, I ask if doing something then would reduce the number of women who have been subjected to horrible things at his hands, as we read in the newspapers now," the woman told the TV channel.
A joint investigation by The Times, The Sunday Times and Britain's Channel Four on Saturday published accusations of rape, sexual assault and psychological abuse by four women.
Russell Brand, 48, denies the accusations, which the perpetrators said took place between 2006 and 2013, saying his relationships had always been "consensual".
British Prime Minister Rishi Sunak's spokesman described the allegations as "extremely serious and troubling", adding that Sunak "made it clear that there should never be room for harassment anywhere".
Bluebird, which had planned to release a book signed by Russell Brand at the end of this year, announced the suspension of "all future posts" with the comedian, while the YouTube video platform canceled the circulation of its content.