Hospital police said Sheila Marie Armstrong, 53, was found at a hotel in Dunn.
Police said that Armstrong was at the ER at 800 Tilgham Drive for about a half-hour, then disappeared before she could be registered as a patient. A Silver Alert for her was issued early Saturday.
Developed in 2007, the Silver Alert system quickly notifies the public about missing endangered adults who suffer from dementia or other cognitive impairments.
It also allows caregivers and nursing homes to report a person missing. In the past, only a family member could report an adult missing.