I do believe that she need to travel outside US to get her H4 back if she use EAD therefore her status changes to AOS. In case your I-140 get rejected, she will lose her AOS. A lot of previous post addressed that questions. You can search XiaoBaitu's and others' answer to that.
However, I am not a professional in immigration therefore I can't guarantee you my understanding is correct. I think that Xiaobaitu and mytwocents will be better person to ask regarding this question.
Good luck.
回複:Thanks!Please confirm the answer for question #4.
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• Thank you very much! -TSH- ♂ (0 bytes) () 04/16/2006 postreply 21:12:22