-Touch the shoulder in follow through. This is really important because it helps power the release. Make sure you remind yourself after every pitch by touching your shoulder 2-3 times. This shows your AC that you've caught yourself doing that whippy thing again and are working to improve.
I have watched all the videos and this might be a nit pick.
DD is right handed pitcher, should she touch her right or left shoulder on her follow through Or does it not matter?