Literally just grabbed two 40-pounders, kneeled down on my exercise map and did the exact same thing. Not easy, but it didn't kill me either. I'm pretty sure she has way bigger arms than me and she was clearly having trouble on the 6th rep. I highly doubt that her orbiter took that video during her last set.
Whenever I see gifs of huge girls curling, it's almost always like 25lbs. That's what doesn't make sense to me. I shouldn't have said the weight was tiny, but 35lbs or so is definitely less than I would expect given her massive arms. I don't know, maybe there's something I'm missing.