Beverley Concannon has admitted causing unnecessary suffering to four dogs that went on to kill Jade Lomas-Anderson, a 14-year-old girl.
The schoolgirl died after she was attacked by two bull mastiffs and two Staffordshire bull terriers in Wigan, Greater Manchester, on March 26.
The dogs were owned by Beverley Concannon, whose former home was where the teenager died.
Concannon, 45, pleaded guilty at Wigan Magistrates' Court today to the cruelty offence under the Animal Welfare Act 2006, which could bring a jail sentence.
Concannon bowed her head in the dock throughout the brief hearing.
She admitted causing unnecessary suffering to bull mastiffs Buddy and Neo and Staffordshire bull terriers Ty and Sky between July 19 last year and March 25 this year.
The details of the charge was that she subjected the animals to "an environment that was detrimental to their well-being" and she knew or ought to have reasonably known what she had done.
An alternative charge of not ensuring the welfare of the dogs between the same dates was dropped, as was a third charge of causing unnecessary suffering on March 26 when the dogs were shot by the police.
Concannon was granted unconditional bail until sentencing on October 18.
Jade was visiting a friend at Concannon's former home in Chaucer Grove, Atherton, when the incident took place.
Following the discovery of Jade's body, armed officers shot the four dogs dead.
Earlier this month when announcing the cruelty charges, the Crown Prosecution Service said there was insufficient evidence to bring a charge of manslaughter by gross negligence against Concannon.
It also said it could not bring any charges under the Dangerous Dogs Act because the four dogs were not banned breeds and were not out of control in a public place.
Jade's mother, Shirley, and stepfather, Michael, did not attend the hearing.
A group of friends sat in court and said they were representing them today.
Outside court, one of them said: "They couldn't face coming today.
"I hope that woman rots in hell."