Answer:
Her posterior pituitary gland will secrete vasopressin.
Step-by-step explanation:
The hormone vasopressin is synthesized by hypothalamus. This hormone is stored and secreted in blood by posterior pituitary gland. Under the conditions of dehydration, posterior pituitary gland release vasopressin hormone which in turn targets kidneys to stimulate reabsorption of water and formation of concentrated urine to prevent any further loss of water.