Final answer:
The client is at greatest risk for preeclampsia, evidenced by increased blood pressure (152/105 mm Hg) and a reported headache after delivery.
Step-by-step explanation:
The client is at greatest risk for developing preeclampsia, as evidenced by increased blood pressure. Preeclampsia is characterized by new-onset hypertension after the 20th week of pregnancy, often accompanied by other signs such as proteinuria, severe headaches, changes in vision, and edema. In this case, the client's marked hypertension (152/105 mm Hg) after giving birth is a concerning indicator. Additionally, the client reports a headache, another symptom associated with preeclampsia, although no proteinuria is present. The presence of bilateral lower extremity edema could also support the diagnosis of preeclampsia, but in this scenario, the elevated blood pressure and reported headache are more indicative of this condition.