The EastEnders star was diagnosed with the disease four years ago.
Dame Barbara Windsor is said to be “thrilled” by the reaction from the public over her Alzheimer’s diagnosis.
Broadcaster and journalist Jane Moore, who revealed the actress had been diagnosed with the disease in an interview with her husband Scott Mitchell, said the former EastEnders star was having a “good day” after the news broke.
Jane told ITV’s This Morning that she spoke to Dame Barbara and Scott on her way to appear on the TV show, and added: “She’s totally aware of what is happening today. She is watching now.
“And she’s thrilled to bits there has been such a positive response from the media and from the public.”
Jane, a close friend of Dame Barbara’s, said the TV and film star “sometimes repeats herself and gets a bit confused”.
She added: “But she knows who she is. She knows her history and she knows what she has done.”
Jane said she had known of the disease for about two to three years, as did many other friends of Dame Barbara, including David Walliams and Christopher Biggins.
She said of her interview, published in The Sun: “Scott, her husband, was adamant he didn’t want that coming out. In the early days her symptoms were very mild. To a certain extent she protected herself by being in a bit of denial.
“The really sad thing about the interview … when I was interviewing him, he was so upset when he was talking to me.
“And it was a release but he felt so guilty because he felt he couldn’t protect her anymore. She was becoming housebound.
“Whenever they went out – and the public were like moths to a flame with Barbara and she loves them – and whenever they went out he was really worried she was going to do something that might put it out there.
“He wanted to be in control of the situation, so he rang me last week and said, ‘I can’t protect her anymore. I want to tell people in a controlled way’.”
Jane, also a panellist on Loose Women, said the positive outcome for revealing her battle with Alzheimer’s was that the couple would now be able to go out more.
Dame Barbara, 80, was diagnosed with Alzheimer’s disease in 2014, but Scott, 55, revealed her symptoms had worsened in recent weeks.