Mareile is a German native who founded the Reiselust travel agency in Kiel, Germany. She is the organizer of Nepal's Belmont Adventure Pvt. Ltd. in Germany. She has been managing many types of tours, including air tickets all over the world at low prices, in addition to organizing tours, trekking, and climbing programs in Nepal. Since 2004, Mareile has been active in a variety of social welfare programs in Nepal.