The arrest of 29-year-old Amber Graziano, of Ridley Park, was announced on Wednesday.
Investigators said Graziano suffered a heroin overdose on Monday evening. She was found by the 73-year-old patient, who called 911.
Graziano was rushed to the hospital, but police say upon being released she went back to the home to confront that patient. She was upset, police say, because both the police and her work had been called and she was out of a job.
But police said Graziano should be grateful for the patient's actions.
"This 73-year-old woman saved her life. There's no doubt she saved her life," said Upper Darby Police Superintendent Michael Chitwood.
Graziano was charged with recklessly endangering another person.
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