She will need a cosponsor.
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My understanding is that only her current income must be above the poverty line. However, you will have to prove this to the satisfaction of uscis. Adjustment is a more complicated process than you may realize and you would be wise to consult with a lawyer before filing.
I believe you will need a co-sponsor because you can't use your own income unless you were authorized to work.
973-984-0800. Please be advised my answers to questions does not constitute legal advise and you should not rely on it, due to the fact that we have never met, I have not been aprised of the facts in you case nor have I reviewed any documents.