Frances Garrett says she called a mental health facility to try and get her inpatient treatment for her 50-year-old daughter Michelle Cusseaux.
She says her daughter suffered from depression, bi-polar disorder and schizophrenia.
Police were called to an apartment complex in Maryvale around 3 p.m. Thursday to serve what officers called an "Emergency Mental Health Pick Up Order."
They say Cusseaux was shot because she was holding a claw hammer above her head and came toward the officer. She later died at a hospital.
Phoenix police say they are conducting a criminal and administrative investigation, which is normal protocol in an officer-involved shooting.