(1) A principal whose directive is irrevocable during a period of incapacity and who has provided consent to inpatient treatment in the directive or authorized an agent to consent to inpatient treatment may be admitted to inpatient mental health treatment if:
(a) a physician or psychiatric advanced practice registered nurse performs an evaluation of the principal, including consideration of history, diagnosis, and treatment needs, and makes a written determination that the principal needs further inpatient evaluation or treatment that cannot be provided in a less restrictive setting; and
(b) the agent, if any, provides written consent.
(2) The directive may provide limited consent to inpatient treatment, including limitations upon the length of time for each period of hospitalization and limitations on the facility or facilities to which the principal consents to be admitted.