I didn't have any difficulty in getting my wife in US in F-2. Let me share my experience with you.

I married her when I went back to Nepal on F-1 visa. I came back to the US, and have International Student Coordinator prepare I-20 for her as a dependent.

Before the university issued her an I-20,  I had to furnish the bank balance as required by my school. I was in GA. I didn't really need to show any money, still showed some 4k at that time.  After I get the I-20 for her, I sent the I-20 with the letter addressing to the US Embassy to issue F-2 visa for my wife and documents (such as my I-20, transcripts, copies of passport and visa) to prove myself as a student here.

My wife was sponsored by her father, my family and she also had bank balance in her name. In every case, we showed more than 10 lakhs in each bank account. She didn't have any problem in getting F-2 in her first interview.

Hope this helps.