Greninger was operating the large commercial meat grinder about 11:40 a.m. when she either fell in or was pulled in, said coroner Charles E. Kiessling Jr.
"This is just a tragedy", Kiessling told the outlet.
Greninger died at the scene, and first responders spent 45 minutes disassembling the meat grinder to remove the victim's body.
Kiessling added that she was standing on a set of stairs on wheels at the time of the accident, and that the grinder was about six feet off of the ground. She died inside the moving parts of the machine.
"We talked to the person who found her", Kiessling told ABC.
Another employee at the plant reportedly found the victim.
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Company officials have not responded to media requests for comment.
Greninger's friend Erin Schreffler shared on Facebook that the woman was "an unbelievable friend and person" who "touched so many lives".
The Occupation Safety and Health Administration, part of the US Department of Labor, are now carrying out an investigation.
The woman, who worked at the Economy Locker Storage in Muncy, was found dead Monday morning by a co-worker but no one witnessed the incident, authorities said.
Greninger's death is the first reported at the Economy Locker Storage Company.
"My heart goes out to everyone who is affected by this", a local resident told WNEP.