A domestic violence survivor in Oklahoma walked free from prison on Friday, according to a corrections spokeswoman, after spending 15 years behind bars for failing to report that her boyfriend was also abusing their children.

The woman, Tondalao Hall , was 19 when she was arrested after her boyfriend, Robert Braxton Jr., abused their two children, leaving at least one of them with several broken bones, said Megan Lambert , a lawyer from the American Civil Liberties Union who represented Ms. Hall.

Ms. Hall was released at 11 a.m. on Friday, according to a spokeswoman for the Mabel Bassett Correctional Center in McLoud, Okla., where she had been held.

Ms. Lambert did not immediately respond to requests for comment on Friday about Ms. Hall’s release.

The couple was arrested on child abuse charges soon after Ms. Hall took her middle child to the hospital in 2004, having discovered he had swollen legs, Ms. Lambert said.