If she is going to be in the USA that long, you might aswell do adjustment of status. But if you do that, she will not be able to leave the USA until her green card arrives and she wont be able to work until she gets her employment autorization (or green card if she does not file for employment authorization). If you decide to go this route, there is an amazing guide on here for that. if you do decide to go with the spouse visa, then no, it wont be done by September.