Marta C González was a ballerina in New York in the 1960s.
Scott Mitchell has said it “feels like a bereavement” after the EastEnders star left their home in mid-July.
The former EastEnders actor recently completed a documentary about dementia, which starred Dame Barbara and her husband Scott Mitchell.
Scientists said the blood test could "have an enormous impact" on the cost of the disease as well as the human suffering that goes with it.
She said she was "truly overwhelmed by the generosity of the British public".
"The confusion does progress and that becomes a lot more stressful for her."
Families like my own, who moved to the UK from India, brought outdated attitudes towards dementia with them. Misinformation prevents people with the condition and their carers seeking help