She has immigrant intent and would have a difficult time obtaining a visit visa.

Since you are only a LPR, she would need to wait for her priority date to become current. Illegal presence would not be forgiven as would be if you were a US citizen. She would need to leave and reenter properly after consular processing.

The proper thing to do is for you to go there, get married, file for her GC, she wait in her home country for priority date, go through consular processing as the spouse of LPR, and enter the US once GC is granted.

Read the USCIS instructions for family based filings. If you do not understand the process, consult an attorney.