The current princess of Liechtenstein is the patron of the Red Cross, she founded and runs an association in support women and their children in need, she is involved with family art collection and accompanies her husband to many official events abroad.
It's a role that doesn't change that much from what other royal consort in Europe.
Sorry but if Liechtenstein princely family is so 'poor' and 'irrelevant' to you, what are you doing here? We are just here to share some news about them and you are here to belittle everything about this family. If you have no new info about Wenzel or his siblings, go follow other royals, if you don't like them. Don't waste your time.
Thank you for sharing what the current princess does. I imagine Wenzel future wife will do many charitable/humanitarian works as well as official duties.