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Maureen Perry, of Chelmsford, received her four-hour dialysis treatment at Fresenius Medical Care in Methuen on Saturday. After the treatment was over, the staff closed the building, forgetting she was inside, her granddaughter, Erica Crosby told WFXT.

As reported on WFXT, staff at the rehab later notified Perry's family, three hours after the clinic had been closed. Crosby and her mother rushed to the clinic, doubtful Perry would still be inside.

Crosby called 911 and snapped a picture of her grandmother sitting alone in her chair through the window. Firefighters unlocked the building and let them inside.

"She's really, really shaken up still," Crosby told WFXT. "We saw her this morning, and she was just beside herself still, can't wrap her head around what unfolded."

Methuen police said they filed a report with the state Department of Elder Affairs, the Department of Public Health and the Commonwealth Board of Registration in Medicine. The matter is not criminal, police said.

"I just don't want this to happen to anyone else," Crosby said. "That's my bottom line."