“She’ll stare off into the distance and seems unfocused. She seems to get confused a lot and she can’t remember things," the source said. "Many fear it’s Alzheimer’s or dementia. She’s pretty much homebound and hates it. She appears ready to go at any moment!” Photo credit: Mega

Sadly, she knows it — despite her peppy public persona , sources said. The friend notes the star has been “planning her funeral” and wants to go out in style. Her final curtain call will probably come sooner rather than later, insiders predict. Photo credit: Mega

Although a rep trashed talk that Betty is facing the end and said the actress is “alive and well, in perfect health and not dying,” a pal insisted the Sept. 18 Emmy ceremony in Los Angeles was the star’s “last hurrah, and I think everyone knew it. Photo credit: Getty Images

“She mustered all the strength she could for that appearance," said the pal. "Betty didn’t want to look sickly. She wanted to go out with a bang!” The iconic actress was “all gussied up” in a black dress and “tons of makeup,” while joking with the star-studded crowd. Photo credit: Mega

"It’s incredible that I’m still in this business and you are still putting up with me," said Betty (shown here in 2015 People's Choice Awards) to the appreciative crowd. "It’s incredible that you can stay in a career this long and still have people put up with you. I wish they did that at home.” Photo credit: InStar

But Florida longevity expert Dr. Gabe Mirkin, who has not treated White, told The ENQUIRER: “Betty looks debilitated” and is at risk for heart failure. "The vast majority of people who die of natural causes in old age really died of heart failure,” Dr. Mirkin said. Photo credit: Mega

"Your heart will become weaker because you don’t exercise and that accelerates the rate at which your heart weakens," Dr. Mirkin noted. “Eventually the heart can become too weak to pump blood through the body.” Photo credit: Getty Images

Jane Leeves tattled: “She eats Red Vines candy, hot dogs, French fries and Diet Coke.” Betty herself once told a source she sticks to a strict diet of “vodka and hot dogs, probably in that order.” Friends and co-stars say Betty has neglected her health for years. In 2011, her " Hot in Cleveland " co-startattled: “She eats Red Vines candy, hot dogs, French fries and Diet Coke.” Betty herself once told a source she sticks to a strict diet of “vodka and hot dogs, probably in that order.” Photo credit: Getty Images

Last year, animal-loving Betty was reportedly battling a crippling illness that forced her to make a desperate, hush-hush dash to her doctor’s office after collapsing at home! Betty appeared gaunt, pasty-faced and shaky as she clung tightly to an assistant’s arm. Photo credit: Mega

New York internist Dr. Stuart Fischer, who also has not treated White, told The ENQUIRER he suspects “arteriosclerosis” caused the collapse. “People of advanced age are forced to endure inflammatory chemicals that overwhelm the body, causing rapidly narrowing arteries that force a rapid blood pressure drop and explain the collapse,” said Fischer. Photo credit: Mega