There are many things you can do to help her. The first thing I would do is have her use another release where it has some pressure behind it. I don't like "hair" triggers for the reason that it induces people jumping on them because they are so sensitive and they hurry to get the shot off. Below are a couple of things you can try.
1. Have her blind bale shoot 6ft in front of a bag...put a towel over the sight, or have her close her eyes and just 100% concentrate on constantly squeezing thru the shot with someone watching/reminding her before every shot.
2. Take a 3/4" PVC pipe cut down to 8" and drill 2 holes near each end and take a bungie cord and run thru the drill holes and knot them off once they get to the desired draw length and tie a d-loop and she can practice anytime on the proper release.
3. You can buy a release like Golden Key's "The Answer" that will definitely fix her, but they are hard to find (went out of business years ago) and you 100% cannot get it to fire by punching it....they can be found on AT from time to time for $100-$175.
4. Bernie's has a "Can't Punch Release" that I've heard is like The Answer...
http://www.robinhoodvideos.com/index.ph ... path=50_62
5. Get an arrow and pop her on the head every time she punches it....
That actually works...LOL
It is all mental in her head and if you can get her to the point where the last thing in her head during the shot cycle is squeezing through the shot then you are golden! I had some issues due to injury over the last couple of years that caused all kinds of problems in my shooting and I've had to retrain and reinforce my own habits to where I don't think about the shot....I think about squeezing through the shot—it's the last and only thing I think about during the shot cycle. If she doesn't get the slapping/punching under control, it can lead to a whole bunch of serious problems down the road like anticipation/confidence loss/target panic.
One more thing, some people respond better if they can visually see what they are doing. There is a phone app called "coach's eye" that you can record a video and then slow it down frame by frame. It was initially designed for baseball/softball, but I have used it many times to demonstrate. You can record her and show her either what she is doing right or wrong via slow speed video playback.