Meaning of "she were to come tomorrow"

[Learning_English]

If she were to come tomorrow, I would want you to tell her to get the book.

Is this sentence mean (If she comes tomorrow, I tell her to get the book)?

Please help me.
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Please let me know if I have made any mistakes in any of my sentences.

[Conchita]

You almost have it right! The sentence actually means:

If she comes tomorrow, tell her to get the book.

[Yankee]