GLENDALE, Ariz. - A six-month-old baby girl is dead and a Glendale woman is in custody after police say she used a comforter to smother her child.

According to police, officers responded to a call at a Glendale apartment from a father who said his fiance, Amber Sagarnaga, had smothered their child and the baby wasn't breathing.

Police said the baby was blue in color, not breathing, and her eyes were open. A foamy mucus was also coming from her mouth. She was taken to a hospital where she was pronounced dead.

According to court paperwork, the baby had apparently been wearing the soiled diaper for more than a day and she had a severe rash.

In an interview with police, the child father's said Sagarnaga battles depression and self-medicates with marijuana. He also told police he performed CPR before stopping to tell Sagarnaga to clean the apartment out of fear that Child Protective Services would take away his other children.

According to court documents, Sagarnaga admitted to placing the comforter over the baby's face because she was crying. She described pushing down on the comforter for a "unknown amount of time, " but told police the baby was still crying after she did this.

She told police she left the comforter on the baby and fell asleep with her two other children.

Sagarnaga, according to court paperwork, admitted to struggling with depression and told police it has gotten worse since having children. She said she never felt close to her now-deceased baby girl and even thought about giving her up for adoption at birth.

She reportedly also admitted, according to court documents, she's thought about killing both herself and the three children because she "couldn't take it anymore."

Sagarnaga was arrested Friday.