Sorry, I am not sure what is PD? The petition was submitted years ago and they received an approval notice from NVC few months ago saying it is now ready to go to interview stage pending all documents are submitted. Since my friend and his wife are still abroad, and their daughter is here in USA, I wonder if she has to fly back for the interview since she is an unmarried 20 year old applicant or can she do Adjustment of status? I am not sure if my friend called USCIS or NVC yet.