What is your knowledge of TTB? Also it looks like she doesn't create a very good swing path (doesn't know how to use tilt, drops her back shoulder). And then there is bat drag.
I recently purchased a heavy bag for practicing "the swing". The swing can be worked on without trying to hit a ball. I don't know why I waited so long to buy one.
Its Drop the barrel swing flat. .
I believe its a sequence issue in IMO as I posted on the other thread the OP posted.Dbsf is a symptom of?