Immigration Law Questions? Ask an Immigration Lawyer.
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If you are asking here for a visit, then there is little that you can do. She has to apply for both herself and her son at the nearest US Embassy/Consulate, for a B2 (visitor) visa. See HERE. The only thing that you can do is send a letter of recommendation to the Embassy/consulate once she begins the application, stating that you believe her to be a moral person who will not overstay her visa. See HERE for an example.
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