The new indictments come ahead of her scheduled mandatory release from prison in March 2018. The grand jury recommended a $1 million bond, and she will be extradited to a jail in Bexar County to await another trial, said Nicholas LaHood, the district attorney for Bexar County.

In a telephone interview on Friday, Mr. LaHood said he asked investigators in Bexar County after he took office in 2015 to re-examine the Jones case. They sifted through whatever medical records they could find and interviewed eyewitnesses, looking into the records of children who died either during or around her shift times, he said. There is no statute of limitations for murder in Texas.

“It was unconscionable that she was suspected of up to 60 murders, and everyone felt they could not do anything,” he said.

“Our intention is to hold her accountable for as many deaths as the evidence will support,” Mr. LaHood said. “But we have to have the evidence. So we will continue to work within the confines of the law to do that. We are going to take one at a time. I am fairly confident we are not going to get 60 indictments on her, but we will get as many as the evidence supports.”