回複：母親被拒簽, 是否可以馬上再次預約下次簽證呢? 大概要多久才能在簽呢?

My father was denied in Noverber in Beijing, the reason is he fotgot to take the approval notice of extension of stay in his last stay in US, issued by USCIS. then He took it next time, it was approved.

So don't worry, if denied, make sure to know why denied. and take those docs next time.

Good luck.