she can try B1/B2 visa

to come to the US, but to stay, she still has to change to another independent nonimmigrant status like F or H. Because green card holder's spouse is subject to visa caps, and the wait is at least 4+ years no matter where she is applying. If she is in the States, she has to remain in legal status while waiting. If she is in china, she won't be able to come to US unless it is through H1 which allows for dual intent.