It all depends upon the luck bro. Most important thing is that you should provide a strong financial standing and make them sure that your are not potential immigrant and will return after the completion of your study. I had gone through the similar situation last April. My wife applied for F2 and she got visa without much questioned asked. I didn't even had a scholarship and had to pay 8k every semester out of my pocket. The documents I provided were as follow

• Enrollment verification letter from the university
• F1 and F2 i-20
• Receipt from my previous tuition bill payments
• Recommendation letters stating that i am a good student
• Small album containing about 25 pictures
• Marriage registration certificate and Relation ship verification from ward. office
• Bank balance, source of income and other financial assets 

All I have to say is give it a try. I have gone through the situation and every thing seemed against me. But without listening to any one I decided to go for it and right now we are together. If your wife is giving interview by herself, make sure you make a list of potential question that the consular could ask and make her go through it. I did the same thing so that she feels confident. Good luck brother!!