Can my mother leave for 2 months?

I had concurrently filed for my mother's I130 and I485 about 5 months ago, I also applied I131 (advance parole) and received the approved document. Today I got a letter from USCIS that my mother's application is a potential interview waiver case and also mentioned that there's a delay of approx. 6 months in processing the case. My mother would like to leave for a short time to go see my other sister in South America. In the light of current situation and with advance parole document is it ok for her to leave for a couple months?