Advice Planning a Trip from Bosnia-Herzegovina to Poland

My mother, who is fully Polish, and I have been dreaming about visiting Poland for years. Recently, we received an invitation to a wedding there, which seems like the perfect opportunity. However, we're a bit overwhelmed with planning the trip from Bosnia-Herzegovina to Poland. We're looking for advice on the best way to travel between these countries. Should we fly, or is taking a train or bus a better option considering the scenic routes? Also, any recommendations on must-visit places in Poland, especially those with a rich Polish heritage, would be incredibly helpful. We want this trip to be memorable for my mother, connecting her with her roots. Any tips or insights would be greatly appreciated!