Final answer:
The nurse should ask the healthcare provider (HP) to administer synthetic oxytocin (Pitocin) to restart and maintain labor.
Step-by-step explanation:
In this scenario, the nurse should ask the healthcare provider (HP) to administer synthetic oxytocin, also known as Pitocin, to restart and maintain labor. Pitocin is a synthetic form of the hormone oxytocin, which stimulates the contractions of the uterus during labor.