well, you can get married and go to the interview together. You will need to prove that the marriage is not fake.
You can go to the interview by yourself, then marry, then get an interview for your wife, and you will need to prove that the marriage is not fake.
You can go to the interview by yourself, then marry, then enter the US, file form I-824 and do a following to join process for your wife. She needs to finish the process by Sep 30. Unikely, but doable.
You can go to the interview by yourself, then marry, then enter the US, then file I-130 and wait for your wife for 6 years.
Since you just met this girl (apparently), what makes you think that you want to risk your chance of getting a GC to get her a GC?