A physician, Dr. Hooman Melamed, told People that Miller had to undergo emergency spinal surgery Tuesday, in which parts of her vertebrae were removed. Doctors later discovered she had non-Hodgkin's lymphoma, according to Melamed.

ABC News reached out to a rep for Miller, but didn't immediately hear back.

Miller's harrowing health news comes a month after she was released from prison and sent to a halfway house in Long Beach, California, the Federal Bureau of Prisons confirmed to ABC News back in March.

\"PHOTO:
Desiree Stone/Getty Images
PHOTO: Abby Lee Miller attends the OK! Magazine Pre-GRAMMY Event at Avalon Hollywood on Feb. 9, 2017 in Los Angeles.
>

The former star was sentenced to a year and a day in prison last year for bankruptcy fraud and bringing $120,000 worth of Australian currency into the country without reporting it.

Before reporting for her sentence last summer, Miller sat down with her former network, Lifetime, for a special titled \"Abby Tells All,\" detailing her deepest fears and coming to terms with her past mistakes.

“I am petrified,” she said during the show. \"I hope it won't be as bad as I imagine... If a whole bunch of people want to make your life a living hell, they're going to do it.\"

She also questioned what would happen when she got out of prison.

\"Will I come out and have nothing?\" she questioned. \"That's more scary than going in.\"

Dominick Proto contributed to this report.

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