She should be fine and in the clear. Make sure she carries that letter of her.
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She should be able to enter the country given that the case was dismissed. She needs to carry documentation with her to show the case was dismissed.
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She should be fine. You can also get a certified criminal record check from the clerk of court in the county where the charged happened and it will show no conviction, since the matter was expunged. I suggest that because it comes from the court. The letter is just an explanation of the expungement process, where as the certified record will be an official document. You should be fine with the letter, but if you need something more official the certified record check would serve that purpose.
She should be fine. You should carry letter with her. Have a good trip.
Attorney Robert Brown's (former INS Director, 1972-99) reply to your question is general in nature, and does not constitute legal advice as all facts are known to him. For specific advice or representation you should retain an attorney experienced in immigration law. Mr. Brown's reply on AVVO does not create an attorney/client relationship not constitute legal advice.