My fiancé came here for 6 months to attend high school. She then decided to stay and attend college as well, but her visa has been expired for over 6 years. I proposed to her and we are wanting to get married. Can anyone please help me with the process? Is it possible for her to gain citizenship? I am wanting to travel to Taiwan with her and meet her immediate family, but I know she won't be able to return due to her over staying her expired visa. Any help is greatly appreciated.

Thanks