A parent has the right and the duty to care for and control a child until they turn 18. This extends to making decisions about her medical care.

If a girl is in need of medical care (a pregnant girl needs prenatal care) and the parent is not providing it, then the girl may be able to get help from the state. However, this cannot be done without the parents knowing about it.

Although not specifically asked, abortion is a topic important to this answer. According to Arizona law (ARS § 36-2152), a minor cannot have an abortion unless she has written consent from one parent, or her guardian, or if a judge authorizes the abortion. This law allows a minor to file a petition for a hearing at which time the judge will decide if an abortion should go forward without the consent of the parents. This hearing can take place without the parents being informed.

A doctor may perform an abortion without permission from the parent or from a court if the minor certified to him that the pregnancy resulted from sexual conduct with a parent, stepparent, uncle, grandparent, sibling, adoptive parent, legal guardian, foster parent or a person who lives in the same household as the minor and her mother. He must then make a report to law enforcement officials, who will investigate.

A doctor may also perform an abortion if he believes, based on his review of the medical records of the minor that there is a medical condition that makes it necessary for an immediate abortion to save her life, or where delay will create a risk of substantial and irreversible impairment of major bodily function.