Looks like the technique on the counter is not great -- if you watch in slow motion she actually changes edge before the turn, so technically it's an edge change followed by a back inside three turn. But in real time it's not that noticeable. And either way it's difficult. (According to my notes, Yuka Nagai did her 2A from an intentional BI three.)
As for Chen's technique on the axel, compare it to other axels starting from the point after she has turned forward onto the FO edge. Nice speed, height, and distance across the ice, well controlled, stretch on the landing, as well as the difficult entry. I agree with all the +2s she got.I thought it was great! Good height and nice speed and flow out of it. I've seen several skaters use that entrance before.
Just watching each program once, I actually had Sotskova highest on Performance/Execution, mainly because of energy and commitment to the performance and execution of the elements -- I would have given her +1 or +2 on every element. Maybe I'd change my mind if I watched all the top girls again, maybe not.
Her top jumps R: 3F+1Lo+3S, 3Lz+3T, 3F+3T
Video of her most recent Free skate at Open Skates in Moscow in mid-August
Kayumova is a good jumper, but that's all. Her club teammate Proklova is more consistent and has very good spins.