if you have graduate assistantship, you can ask her to come here as a dependent.  however, if she is a good student and can do well in GMAT and TOEFL, applying as a F1 student is a good too.  But remember, if you both are in F1 and dont have assistantship to support education, it will be really tough.  i have seen people who have completed their education with support of spouse.  good luck.