What she shows is not North Korea. What she shows is what the propaganda from the communist party leaders wants foreigners to see. The truth is way less rosy (which, yes, makes it really very scary).
The hotel is fake. The trafic is fake. The shops are fake. She did realize that they do create products that don't have a market but it's worse than that: they create fake malls (well, actually one fake mall, which every single visitor shall see if he wants to see a mall) just to make believe visitors that they have malls.
The entire trip is under supervision and every "delegation" that goes there get to see the exact same things, give or take one or two things.
For example the tramway picture: it's in basically every single movie show from foreign "journalist" who got to get there. I say "journalist" because they're not allowed to do anything on their own: they're constantly accompanied by members from the party.
Poverty is hidden in basically every street where, of course, you're not allowed to go.
I speak several languages so I can watch TV from different countries: it's always the same. At one point me and my girlfriend considered going, so we started watching as much movies as we could about North Korea and we started to realize that all the (totally non-connected) delegations were always doing the exact same visits. After three of them we knew what we were going to see in the fourth one.
What about the truth? Well independent reporters have reported famine and people eating roots during cold winters.
It's really frightening to realize what communism does to people from both a liberty point of view and a poverty point of view.
I'm honestly not sure the author understood what happened to her.