请教有经验的朋友， 我刚开始给父母办绿卡， 可我母亲有急事要回国一趟， 估计2个月就回来。 我的问题是：
1。她此次回国， 两个月后回来， 海关入境会不会 拒绝她再进入美国？
-Yes. It is very possible. She needs to have Advanced parole (AP) to travel to China.
因为她已递交了移民申请？
2。在她留中国期间，她可以在广州签移民签证吗？
-Yes, but she had better file I-864 to change I-485 to consular processing to apply for the immigration visa in Guangzhou after she receives the I-485 filing receipt if she has to leave US by this time if she has no AP in hand.
3。在她留中国期间， 如果收到打指模的要求， 是否可以重新预约。
-If she leave US without AP, her I-485 is invalid and thus, the biometrics is useless to her.
