Missing Princess Isabeau in RDR2

Finding Missing Princess Isabeau in Red Dead Redemption 2
In RDR2, there is a missing Princess Isabeau Katharina Zinsmeister. Her belongings are at the Van Horn Fence (found luggage having IKZ initials). Many suspect that she is on the second floor of Van Horn Fence. Videos below shows all the details and clues of the missing Princess.