How Did Beth on ‘Yellowstone’ Not Know About The Train Station?

Were y'all just as shocked as I was at the end of the last episode of 'Yellowstone'?  How did Beth on 'Yellowstone' not know about the train station.

Beth is the sharpest knife in the drawer on that show.  Nothing gets by her .  So, how in the world did she not know?  We saw this shocker at the end of the last episode.  She has been blackmailing her brother Jamie who dumped a body at the "train station" but he came back at her saying he would expose the family for doing that for centuries.

When we last saw Beth she was confronting her dad, asking him about what goes on at the train station.

I think even the actress who plays Beth was having trouble pulling this scene off.  Get all the details in Taste of Country.