Because of your post I took a shot at this. I think I grabbed a yarn that was too fine, though, because after making 6 circles worth of it (getting out to the chain 13 band), it's still not much larger than my palm.
I could have sworn the person in the video said that she was using a size 3 hook. I didn't know if she meant 3mm or a US 3, but either way that's a pretty small hook, so I picked a yarn to suit.
What weight of yarn are you using for your project? And what size hook, I guess?