"I can't believe someone would bathe her daily for nine months, never know she wasn't having her period, she wasn't growing in her mid-section", one of the woman's former caregivers told ABC15, which did not reveal his or her identity. Hacienda HealthCare, which has 40 programs that serve more than 2,500 people a year in Arizona, according to its website, did not immediately respond to calls and messages seeking comment.
Hacienda HealthCare's chief executive, Bill Timmons, stepped down on Monday, spokesman David Leibowitz said.
"I want to assure our patients, their loved ones, our community partners, the agencies we do business with, Governor Ducey and the residents of Arizona, we will continue to cooperate with Phoenix Police and the investigating agencies at all levels in every way possible", Gary Orman, the executive vice president of the Hacienda board, said in a statement to Arizona's Family.
State officials say they have acted to protect other patients in the wake of the pregnancy.
Karina Cesena told Phoenix independent news station KTVK that she is sleeping in her 22-year-old daughter's room at the facility until the assailant is found.
A week after the victim gave birth, Phoenix police have still released next to nothing about the investigation.More news: China and United States to hold trade talks in Beijing
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The woman said not one person reported the incident out of fear, adding that it is likely other forms of abuse took place over the years.
DISTURBING DETAILS: "None of the staff were aware that she was pregnant until she was pretty much giving birth".
A Phoenix police spokesman said that "the matter is now under investigation" but declined to give any further details of the case. "I haven't been able to sleep good at night because of what occurred here", another mother, Angela Gomez said.
A Hacienda board member says the facility "will accept nothing less than a full accounting of this absolutely horrifying situation".
The CBS source also claimed the facility has introduced a new rule that male staff members are banned from seeing a female patient without a female staff member after the incident.
Hacienda describes itself as Arizona's "leading provider of specialised health care services for medically fragile and chronically ill infants, children, teens, and young adults as well as those with intellectual and developmental disabilities".
One staff member was sacked for making repeated inappropriate sexual comments to patients.