8老師，您好！
搜索一下論壇沒有找到一樣的答案，所以麻煩您有空答複我。
我母親舊綠卡今年四月到期。去年11月網上申請新綠卡到現在沒有消息。
-Normally it takes one to two years.
有收到那份信說是綠卡自動延期一年，就是到明年四月是吧？母親現在想回去，因為疫情開始就在這裏。她隻要帶著護照，舊綠卡，和那份信就可以嗎？
-Yes, but she needs to return before the deadline of the extension (i.e., April 2023) if she cannot get the renewed green card. By the way, she cannot stay in China for more than one year unless she applies for reentry permit.
不需要AP？
-If she returns to US before teh deadline in April 2023, she does not need reentry permit (not AP). If she wants to stay in China for more than one year, she needs to apply for reenry permit.
她是不是必須六個月內回來？如果中間需要打指紋怎麽辦？
-Probably USCIS will use her old fingprinting in the system for the green card renewal, not need to conduct a new one.
如果中間收到綠卡就寄給她是吧？
-If she will return before the deadline, April 2023, you do not need to mail it to her. She can use the old green card and the I-90 receipt (letter) to come back. If she returns to US after the deadline, you can mail the new green card to her.
