Cilla Black had to learn to live independently after the death of her husband, as she had never done anything for herself before.
The star married her manager Bobby Willis in 1969, and they were married for 30 years until his death.
He died in 1999 after a short battle with cancer, aged just 57, and for the first time in her life, Cilla was single.
Her friend Paul O'Grady, a talking head in the documentary, revealed: "She'd never done anything for herself, to tell you the truth.
"She'd never used a hole in the wall to get cash out of, she didn't have a clue.
"She'd never been on a bus," he laughed.
"She didn't know how to order a taxi for herself, Bobby had done everything for her."
In footage on the documentary, Cilla spoke of her excitement of the first time she bought a round of drinks independently, aged 59.
Speaking about her husband's death in an unearthed interview, she said: "It's taken two and a half years for it to sink in that really Bobby isn't coming back. Not at all, no way.
"Everybody's said to me since Bobby died, 'You don't know how lucky you were'.
"I'd give my right arm to have Bobby back. He's not coming back. "
The documentary also explained that trailblazer Cilla was a millionaire aged 25, while the average woman was making £10 a week.
Robert, who managed Anyone Who Had a Heart star Cilla, told of the incredible find before the family sold her home in Denham, Bucks.“It was a poignant moment, standing in the kitchen, knowing we were selling the family home we’ve had since 1970,” he said.
“There were tons of tapes because they never threw anything away. I picked an orange one and put it in the cassette player. It was her talking in concert.
“She said, ‘I’m going to sing Liverpool Lullaby.’ This was a song she used to sing to me, Jack and Ben.
“It was incredibly emotional. I got a bit choked. I felt like it was meant to be.” Cilla suffered a stroke following a fall and died, aged 72.
Robert, 49, found her on the balcony of her holiday home in Estepona, near Marbella in Spain.
It had been the first day of her holiday and she’d spent the day enjoying champagne and watching Jeremy Kyle on TV.