You cannot let her I-485 get denied. If hers gets denied due to missing FP, your I-485 cannot be approved based on cross change and have to wait for China visa number.
I guess she doesn't have AP or H4 before she left US, don't attract USCIS attention by delay FP one more time.
I guess she doesn't have AP or H4 before she left US, don't attract USCIS attention by delay FP one more time.