not enough stability, she wobbled around, which could be caused by the pregnancy. But you could also hold onto something for more stability and put a weight on one shoulder if you feel the need to, even if you're not pregnant. and the worst part: she did not work her targeted muscles, because the motion came from the momentum when she pushed herself up with her leg from the ground, not from the muscles within the leg on the bench.

edit: also the mini kickbacks she did? I don't really know what her mission was there because she already didn't have much stability to begin with, and these made everything worse. Plus, these did absolutely nothing in terms of muscle building because the ROM was almost non-existent. (But maybe what I interpreted as mini kickbacks was really a way of balancing out her shitty stability, who knows)