The actress has been taking medication to manage the degenerative disease, but her symptoms have grown worse in recent weeks.
According to The Sun Newspaper, Windsor 80, who is best known for her roles in the Carry On films and British soap EastEnders, was diagnosed with the condition back in April 2014. They will endlessly forget things you've said five seconds ago, and repeatedly ask questions when you've told them the answer several times.
She most famously appeared in over 1,500 episodes of BBC's EastEnders, which began in 1994 and concluded in 2016.
Broadcaster and journalist Jane Moore, who revealed the actress had been diagnosed with the disease in the interview with Mr Mitchell, said the former EastEnders star was having a "good day" after the news broke.
So they decided she should return to Eastenders one last time and that her character should be killed off.
However, Scott went to speak to Dominic, revealing: "So I went to see him and, without giving the full situation, confided that she was really struggling to learn lines and wouldn't ever be coming back again after this". "I hope that doesn't sound odd but when you know something is wrong and you've been looking into it and wondering and wondering 'why are they behaving like this?'. when we got that diagnosis as a family, there was an element of relief, [of] 'oh, that's why.' Then we understood it".
"Shame on you for reporting on this like she's died". To a certain extent she protected herself by being in a bit of denial.
Following her exit, Barbara received a Damehood for her services in show business and charity.
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"One thing about speaking about it and acknowledging it is that you're now on the dementia journey and I think it takes away the fear because it's the fear that's one of the worst things about dementia".
'Rather than me living in fear she might get confused or upset, they'll know that if her behaviour seems unusual, it's due to Alzheimer's and accept it for what it is, ' he added.
Jane added that Scott made the decision to make the announcement because he and Barbara still wanted to go out in public.
Speaking to The Sun, Mitchell said the following: "Since her 80th birthday last August, a definite continual confusion has set in, so it's becoming a lot more hard for us to hide". Maybe it happened like it happens to many of us'.
"Stigma around dementia still exists, and many people are facing it in the shadows".
For most people with Alzheimer's, the first symptoms emerge in the form of memory lapses.
"We are here to support people like Barbara and want to reach everyone with a dementia concern or diagnosis".