I don't know how the immigration system works in the USA, but couldn't she enter on a student visa? Once she's in the country she could start making money. From my former contacts with exotic dancers (purely for research purposes of course
), it seems they make their money cash in hand and work permits don't appear to be necessary.
Like I said, I don't know how things work in the USA but getting her in as a student seems a better option than marrying her. Imagine if you marry her and then one day when you come from work she's gone and all your valuables are missing.