Beverley Concannon, 45, today pleaded guilty at Wigan Magistrates' Court to causing unnecessary suffering to four dogs that went on to kill 14-year-old Jade Lomas-Anderson.
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 18 July 2012 and 25 March 2013.
The charge stated she had 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 18 October.
Additional reporting by PAReuse content