It's important for you and her to understand that most nonimmigrant visas require nonimmigrant intent.
She can come here to study on an F-1 visa temporarily if she intends to return to her country and keep closer ties to her country (and return at a later time to immigrate, for instance with a K3 visa if you're married then and you're a citizen, or through consular processing). Her burden of proof that she has no nonimmigrant intent for F-1 will probably be higher than normal, with a permanent resident husband, so if the tries this she definitely needs a lot of supporting documentation about her ties to her country (my Indian co-workers tell me they are asked for a lot of supporting documentation anyway even without a PR spouse!) and it's quite possible she'll be denied so plan for that too.
If she intends to immigrate on this specific visit, her best option for now would be an H-1B or L-1 which are dual intent visas.