请问，如果再次回来时超过半年，会不会在机场被拒绝入关？她的绿卡会不会失效？现在有什么补救的办法？她治病的情况很难允许她在超过半年之前回美国一趟再回中国继续治疗。
-Bring the evidence of her illness such as hospital bills, Dr. certifiation letter/diagnosis and explain it to the CBP officer (if asked) and I think she will be fine.
事关重大，鞠躬多谢各位朋友了！
