Final answer:
During the evaluation stage of the nursing process, the nurse tests the completeness and validity of her community nursing diagnosis.
Step-by-step explanation:
The stage of the nursing process during which the nurse tests the completeness and validity of her community nursing diagnosis is E) Evaluation. During this stage, the nurse assesses the outcomes of the nursing interventions and determines if the diagnosis was appropriately addressed and resolved. It involves gathering data and comparing the expected outcomes to the actual outcomes.