The deputy mayor for health and human services, Linda Gibbs, pledged the city’s commitment to learning how a 7-year-old Brooklyn girl, Nixzmary Brown, could have died when city agencies had received multiple reports of allegations that she was abused.

Ms. Gibbs yesterday led “an interagency fact-gathering session … to determine all actions these various agencies took and when they took them,” she said in a statement. She found that “in some cases, the information from city agencies is incomplete, in others, the accounts are not consistent.”

The agencies in question included the Administration for Children’s Services, the Department of Education, the Police Department, and the city’s hospital system.

“Resolving those inconsistencies will be a central focus going forward,” Ms. Gibbs said.

On January 10, Nixzmary’s stepfather, Cesar Rodriguez, 27, allegedly killed her in their Bedford-Stuyvesant apartment with a blow to the head, and her mother, Nixzaliz Santiago, 27, allegedly stood by. The case is particularly troubling because Nixzmary had been the subject of abuse allegations in the past, and the Administration for Children’s Services was in the process of investigating one such complaint when she was killed.

“We as a city have failed this child and we want to do everything we can to make sure we don’t fail the next child,” Mayor Bloomberg said a couple of days after the girl’s death.

In response, the commissioner of children’s services, John Mattingly, vowed to begin an agency-wide investigation starting with a review of 9,500 open Brooklyn cases.

Many advocates have been critical of the oversight of the child-welfare agency.

Council Member Bill de Blasio, chairman of the General Welfare Committee, hopes to affect change through legislation he is crafting. One piece would call for an independent review process of the child-welfare agency and the other would require the agency to provide a monthly report of its measures to protect children to the council.

A law signed by Mayor Bloomberg in December established a voluntary independent child welfare parent advocate advisory committee. Consisting of 10 appointed parents who have had dealings with the child welfare agency, the committee will meet at least quarterly and will review the agency’s public documents and submit recommendations in an annual report to the mayor and the council speaker. The law takes effect April 1. Though the agency has an internal version of the panel, the new one, Mr. de Blasio said, by the nature of its independence, will enjoy more freedom to be critical.

While the panel would not address the larger policy and policy implementation issues that were at play in Nixzmary’s death, Mr. de Blasio said, “I think the more light is shed, more criticisms offered, the better off we are.”

Once operational, the panel will provide “a helpful pair of eyes,” but it “would not have had an impact,” in the death of Nixzmary, a spokeswoman for children’s services, Sheila Stainback, said.

The founder of the advocacy organization Children’s Rights, Marcia Lowry, expressed a similar sentiment. “I don’t see how it would’ve conceivably made a difference in this case because the problem was the parents,” she said. The city should create an independent child fatality review team, however, to provide a systemic, non-defensive look at the agency, rather than use the internal team. “I think it’s got to be external,” Ms. Lowry said.