The attacker Dynel Lane, was taken to hospital by her husband. She was carrying the victim's dead baby and told staff she had suffered a miscarriage.
Lane had an online baby registry for boys' clothing and had the due date listed as November 14.
Police rushed to the scene and could hear the victim calling for help inside the home. An officer found the victim in the basement.
The victim was taken to Longmont United Hospital where she underwent surgery and is expected to recover. The baby did not survive the attack.
Longmont police Cmdr Jeff Satur told Daily Mail Online that the female suspect was taken to hospital by her husband.
Lane was reportedly carrying the victim's dead baby and telling hospital staff that she had suffered a miscarriage.
The husband is not a suspect, the police chief said.
ABC7 reported that the husband believed his wife had suffered a miscarriage. Police would not comment on whether the suspect had recently been pregnant.
Public records revealed that Lane is a certified nurse aide.
KDVR reported on Wednesday that a baby registry was set up in Lane's name last year and listed her due date as November 14, 2014. The clothing in the baby registry was for a boy.
After speaking to the victim, police were able to arrest Lane at the hospital at 7.46pm on Wednesday.
Lane was facing charges of first-degree attempted murder, first-degree assault, and child abuse knowingly and recklessly resulting in death, the Boulder District Attorney's Office confirmed on Thursday.
However under Colorado law, the charges are complicated by the fact if a child was not born alive, then homicide charges could not be brought. The Boulder County DA's office does not expect to file charges until next week.
Investigators have not released the name of the suspect or the pregnant woman but said they did not know each other.
The 26-year-old mother-to-be had gone to the home alone to answer the Craigslist ad in Longmont, a town 30 miles outside Denver.
It was not clear if anyone else was in the home at the time.
Police entered the suspect's home on Wednesday night after obtaining a search warrant.
They hoped the search will better explain what motivated the suspect to engage in such a crazed attack.
'This is a tragic case for a mother right now,' Cmdr Satur told Fox 31 Denver. 'She came by this house. She was attacked, and her baby was removed from her.'
The alleged assailant has two children, Satur said. Her husband apparently drove her and the fetus to the hospital.
Lane is scheduled to appear at the Boulder County Jail at 2pm on Thursday
It was not known whether the victim had any other children.
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