You can petition for her but first of all, it will take about 12 years before she would qualify for a visa. Secondly, if she is in the US unlawfully, under the current immigration laws, she will not be eligible for adjustment of status to permanent residence even when the visa number becomes available in 12 years because of her unlawful presence in the US now. If she goes to her home country to get a visa, she will be barred from reentry for 10 years because of the unlawful presence in the US. The only way for her to qualify for adjustment of status to permanent residence within the US if she entered the US lawfully but has since overstayed is through a bona fide marriage to a US citizen.
Answered on Apr 16th, 2013 at 7:59 PM