If your wife entered with inspection by US government officials, she likely can adjust status to that of a legal permanent resident upon her marriage to a US citizen.
How much things will cost depend on the facts. You likely should expect to pay at least $3000 in government fees and attorney's fees.
If you and she have nothing in your histories to prevent the approval of the petitions, she can become an LPR in about 6 months or perhaps even sooner.
What you and your wife should do is review the specific facts with your attorney to find out your legal options.