I've been to 2 of her shows in different countries, with the first being in the UK and second in Brazil.
I was front row centre for the London show and there was a LOT of pushing (to the point where me and my friends were basically punched in the back and one of them eventually fainted). But the thing is it was worth it because we were at the front and the adrenaline rush made up for it. Also, when she was singing most people didn't scream and just sung along so it was actually really nice then. It was just when she came down that it got really chaotic.
In Sao Paulo, I was second row to the left and it was completely different. The people NEVER stopped pushing, they never stopped screaming. I actually could not hear Lana singing for some bits.
My experience at her show in the UK was a lot better than in Brazil, but in general I did kinda get this 'shady' vibe from people. My tip is go with other Lana fans you know and just be nice in the queue and you'll be fine.