The phrase "in her right mind" is often used to describe someone who is sane, rational, and mentally healthy. Antonyms for this phrase might include "mentally unstable," "insane," "irrational," "crazy," or "mad." These words imply a lack of control or rational thought, and may suggest a loss of touch with reality. Alternatively, antonyms for "in her right mind" might include "confused," "dazed," "disoriented," or "bewildered." These words suggest a lack of clarity or focus, but do not necessarily imply a complete loss of mental capacity. Ultimately, the choice of antonym depends on the context and the degree of mental impairment being described.