1. What is my mom going to get after she gets green card?
-- Be sure she like to stay in USA.
-- It is too late if she find out she doesn't like the way to stay in USA.
-- She can go and back freely without GC. She has to stay enough day in USA once she become a GC holder.
2. Is there anything that I might regret in the future due to quit my chinese citizenship?
-- Yes, you will when you see a nicer China...
Thanks!