I can sympathise with your friend's plight, but I'm always amazed people come to sites like this for such advice. Nothwithstanding the undoubted experience and knowledge of many of the people who post here, they are not the ones who can grant you entry to the US.
Tell your friend to go to the US Embassy and explain the situation to them. They will tell her if she needs a visa or not. If they say not, but she's still worried, ask them to put it in writing on headed paper. It still won't guarantee entry (IO's are a law unto themselves it seems) but it'll go a long way towards making her feel better.
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