Final answer:
The nurse should massge the fundus to the midline and reassess for firmness.
Step-by-step explanation:
The nurse should massage the fundus to the midline and reassess for firmness. The fundus being deviated to the right indicates a possible full bladder, which can prevent proper uterine involution and increase the risk of postpartum hemorrhage. Massage will help stimulate uterine contractions and promote involution. Assessing for firmness after massage helps ensure that involution is occurring.