The 85-year-old actress recently returned to screens as Walford's Dot Branning and will soon be heading to Birmingham to narrate a concert about French singer Édith Piaf.
Brown has also been confirmed as part of the cast of Heading Out, a forthcoming BBC Two sitcom starring Dawn French.
Discussing her busy schedule, Brown told the Birmingham Mail: "I've always been used to doing more than one thing at once - I'm a jobbing actress. I don't say 'No, that's not good enough'. I take anything, more or less.
"Anyway, I can't afford to retire. I never had the money to start a pension - I didn't start to make any real money until I was 58 - and now it's not worth much.
"I've always been afraid of being poor when I'm old. I think it's a dreadful thing to be strapped for cash when you are elderly. It's awful when you're young, too, but you always have hope that things can get better.
"As long as I am capable of working, I can learn lines and move around, I will carry on. I think I'd be utterly bored if I stopped. I always like to do different things if I can, which is how I came to be involved in Piaf - The Concert."
Brown added that she isn't sure whether EastEnders bosses have planned exciting stories for Dot following her recent break from screens.
She said: "Don't hold your breath! Seeing as I was away for eight months, it looks like I'd been away for the weekend, as much as anyone talks about it.
"After 27 years on the show, on and off, there's not an awful lot they can do with me. Dot would never have an affair."
Piaf - The Concert is scheduled for February 10 at Birmingham Town Hall.