Hello. Im trying to determine the timing of entry, or if it matters at all. If the petitioner (mother and LPR), who files for minor child under 21 and is approved with i551 in passport. If I decide to stay a few weeks in my country but the child with the approved i551 leaves with my daughter (who is USC) , can she enter the US without me? Or at time of entry do I need to be in the US before or at the time she enters?