A Phoenix woman who police say had been using objects such as a whip, hammer and meat tenderizer to hit her boyfriend's child for nearly two years was arrested on Tuesday.

On March 5, a 12-year-old boy was observed to have scars, abrasions and looped marks across multiple parts of his body that did not appear to be accidental injuries, according to court documents.

The next day, the victim was examined by the child protection team for Phoenix Children's Hospital, who documented the victim had extensive bruising and injuries that were grossly shaped, consistent with being struck at a high velocity with a flexible object, according to court documents.

The team also observed injuries reminiscent of scabbing, scarring and multiple other traumatic skin injuries.

The documents said that the boy was thin for his age and that his injuries were highly consistent with abusive trauma.

During a forensic interview, the victim revealed that from August 2018 to March 2020, his father's girlfriend, Rosa Maria Jamerson, 46, used various objects such as a whip, hammer, kitchen meat tenderizer, and broom to hit him multiple times.

The victim also told investigators that Jamerson had choked him, slapped him and thrown him onto the floor, according to court documents.

Jamerson was arrested on March 17. She denied causing the victim any injuries and claimed he was a liar, according to court documents. She was booked into the 4th Avenue Jail on six counts of felony child abuse.

Jamerson was granted bail and her next court appearance is March 25.

Reach the reporter Connor Van Ligten at Connor.VanLigten@arizonarepublic.com or on Twitter @Connor_VL.