Assuming that she did not enter the US in order to stay (i.e. the decision to get married was made after she entered the U.S.) then these are the steps you need to take:
1.The alien spouse (the non-US citizen) spouse fills form I-693 and visits a civic surgeon to compete the form and requited vaccinations.
2.The couple collects the required documents and passports size pictures and fills the required immigration forms.
3.The couple sends the package including relevant fees to the relevant USCIS office.
4.After several weeks the alien spouse receives an invitation for biometrics taking.
5.Several weeks (up to 90 days) after the biometrics appointment the alien spouse will receive the work authorization card, which allows him or her to legally work in the US, and the advance parole document, which allows him or her to travel outside the US.
6.Several months (usually 3 months) after submitting the application the couple will receive an invitation for an interview.
7.Assuming that all went well during the interview, several weeks after the interview, the alien spouse will receive the conditional green card.
8. 3 months before the expiration of the conditional green card (i.e. 1 year and 9 months after receiving the green card) the alien spouse needs to apply to remove the conditional status of the green card.
9.3 years after receiving the green card the alien spouse can apply for a US citizenship (Naturalization).
You can find the list of forms here :
http://easygration.com/Blog/Entries/2010/1/20_Green_Card_Through_Marriage_Forms.html
Do you live together? do you have proof that this is a real marriage (such as joint checking account)? these are the things you need to consider before the applying, since you will need to prove that the marriage is real.
Congratulations on the wedding!
