Need some advice

I was doing clinical on this floor with my fellow students. The nurse managers came by and talked to us about wanting to hired us. We really want to work on this floor because it's a great floor to work. We learned a lot and enjoyed the experience. After that a few weeks later she told us she is trying to get more positions for us because it was kind of full. She said to wait and not to accept any job offer from other places. A week later, she called and offered most of my fellow students a job except me. I was wondering if I should call and talk to her to see what's going on? I was a little upset because everyone got the job except me. It made me feel so bad and wondering what I did wrong to not get the job. Please give me some advice on whether I should call and ask her. I know she never promised anything to me but I really want to clarification.