Karina shouldn't be deducted for leg separation on that vault. Her legs are totally together until immediately before landing, where they separate a tiny amount that isn't visible in real time.They both separate their legs in the salto — Melnikova's is much earlier, and Schoenmaier only does it at the end. But I feel like you take 0.1 no matter what for that.
Melnikova has both crossed legs and leg separation, bent knee, more piking, lower chest landing. It won't be a bigger deduction on the pike, but that landing position is deductible.
Karina has the .3 step instead of Melnikova's .1, but from entry through landing her form is better by .4, that's .2 advantage to her. Melnikova also could be deducted for two .1 steps on landing, she's leaning back slightly after the first hop and doesn't hold the landing, her step into the salute could be a viewed as a needed step for balance.