Can't take away much from this video but I'll take a shot at why she doesn't look like she uses I/R. She is predominately a screwball pitcher so a majority of the pitches you will see her throw will have "hitch hiker" release action.....a forced motion that is just the opposite of I/R. If you can post a clip of her throwing a curve or drop out to a RHH I am guessing she will use I/R.
Anyone have a clip of that to post?
Also notice her 'fighting' her way to HE. The end of her follow through is more on her opposite shoulder and then she moves her arm across to the HE finish position. Watch the last few pitches she throws - it is pitch, follow through, and then move my arm into where HE instructors want the end position to be.
Also when she does through a screw, as Rick says - her screw is a follow through, thumbs up and/or out - so you wont finish this pitch the way you would throw a straight fastball and your follow through is very pronounced. Basically IR but in the other direction to make it screw rather than curve. There is some images in youtube of this pitch. 1:17 of this video shows the release [video=youtube_share;n3s4Aau_o4M]http://youtu.be/n3s4Aau_o4M[/video]
At 4:00 you can see I/R arm.
And at 0:12-0:14 you can see her illegally leaping