EM@3AM: Aplastic Anemia

A 28-year-old female presents with fatigue, bruising, and vaginal bleeding. She reports a history of heavy menstrual cycles; however, this cycle has been significantly worse. Over the past week, she has experienced dizziness, generalized fatigue, and increased bruising. She felt warm earlier this morning but was not able to take her temperature. She denies any family history of bleeding disorders. Initial vital signs include BP 110/70, HR 120, RR 14, SpO2 100% on RA, and T 100.5F. On exam, she has diffuse petechiae and ecchymoses. Labs reveal hemoglobin 6.5, WBC 1.6, and platelet count of 40. What is the diagnosis?