I think you forgot that Rachel was +7 on a stomp whiff (Yes WHIFF! +15 on hit). Mila gets, like, around +1 on a ground throw whiff in comparison. This also has to take into account how powerful Rachel's offense was when she hits her opponent. I.e. You can get vortexed for the remainder of the round off of one CH stun.
Really Rachel's stomp didn't seem any different from Mila's or Bayman's Ground Throw Option Selects....