A condition is an event upon which a ruling is suspended; the consequence is what becomes relevant upon its fulfillment.
In “إن دخلت الدار فأنت طالق,” entering the house is the stated condition and the later clause expresses its conditional consequence. Faa does not simply list two facts; it connects the consequence to the condition's occurrence.
Compare “She entered and something happened,” which may merely report two events, with “If she enters, then…” which creates a conditional structure. Any concrete legal effect also depends on the other applicable requirements.