Explanation:

Let’s break it down:

- Original Sentence: She's discussing future plans after the arrangements have been made.

- Option 1, "will leave": Implies a definite action in the future, but does not match with the uncertainty usually expressed after "should."

- Option 2, "shall leave": Formal and less commonly used for future plans, especially in American English.

- Option 3, "could leave": Suggests possibility, but in the context where arrangements are ready, it's less suitable.

- Option 4, "would leave": Correctly indicates a future plan based on current readiness. It aligns with the certainty and tone.

- Option 5, "No correction required": Fits situations where the original is perfectly fine, but isn't the best in this case.