The mother of a baby whose disappearance prompted an Amber Alert Sunday was arraigned on a second-degree manslaughter charge Monday morning in Schenectady City Court. Prosecutors have also filed a new charge of depraved indifference murder.

Persia Nelson, 24, was charged less than a day after authorities found her 10-month-old baby, Halo Branton, on the General Electric campus. She was later pronounced dead.

Nelson had been on the GE campus when security found her in a heated building. She claimed she didn’t know how she got there and that she lost her child, investigators said.

“It took some time, but officers were able to connect an address on Campbell Avenue to the female, and this ultimately led officers to the dead end of 12th Street, where they were able to identify where the female went with her baby in a location where she entered the GE campus.” Schenectady Police Chief Eric Clifford said.

Nelson dropped the baby down an approximately 8-foot-deep pipe access area at GE’s main plant, investigators said. Halo was found inside a utility tunnel structure on the GE campus. The documents say there was water and mud at the base that caused Halo’s death. The water had come up to her chest and around her head, but not her face.

The baby was taken to Ellis Hospital. Life-saving measures were performed. However, she was pronounced dead at 1:24 p.m. Based on an autopsy, it’s believed she died from exposure and hypothermia, investigators said.

The mother has no criminal history, but she has another child in Columbia County who she does not have custody of, prosecutors said.

The judge set Nelson’s bail at $500,000.

“Everybody can relate to a 1-year-old child being helpless,” said Schenectady Police Chief Eric Clifford. “At the time, the adrenaline’s rushing, you know, we’re motivated to find her, but, you know, after the reality sets in, it’s definitely taking a toll on everybody.”