The now-former CEO of Hacienda HealthCare, Bill Timmons, has also stayed silent about exactly what he knew and when he knew it.
In a statement released to PEOPLE on Friday, Hacienda HealthCare spokesman David Leibowitz said the organisation, which runs the facility, was cooperating with authorities, but declined to divulge the exact nature of the underlying incident.
"This woman has been here for 10 years and then all of a sudden this baby is born", she said.
The Arizona Department of Economic Security says in an emailed statement that it had sent a team to check on the health and safety of every person in the facility since the pregnancy and birth were reported, and that it was working with Phoenix police on their investigation.
Family members of other patients fear there may be more victims at Hacienda HealthCare, which has a history of patient mistreatment.
Sources tell ABC15 that investigators are hoping to DNA test the staff at Hacienda Healthcare and are evaluating other patients at the establishment. It's not known if the woman has a family or a guardian.
In a statement, board member Gary Orman said the facility "will accept nothing less than a full accounting of this absolutely horrifying situation". According to the local station's unidentified source, the facility staff had no idea the patient was pregnant until she began moaning as she went into labor.
The outlet also reported that the patient has been in a vegetative state for at least a decade after almost drowning.
The birth has triggered a police investigation and reviews by state agencies.
"I wasn't there. I clearly don't have firsthand knowledge of what happened", Meyers said.
"Trust has been severed, period", she said.
Hacienda almost lost its Medicare funding in December 2013 after Arizona Department of Health Services (ADHS) found at least one staff member was abusive to multiple patients while several staff members were deficient in reporting patient allegations of abuse by staff.
Hacienda also announced that all male employees would have to have a female employee accompany them when visiting a female patient's room.
Founded as Hacienda de Los Angeles in 1967, Hacienda HealthCare is described on its website as "the leading provider of specialized medical care and social services for Arizona's infants, children and young adults who are medically fragile or chronically ill, including those with developmental disabilities". But one complaint from December 2013 outlines an allegation that a staff member made inappropriate sexual comments about four patients two months earlier.