One of the reasons that when tees are being used, they must be used properly. The tee is too far forward or she is too far back. She should be making contact before her bottom arm is extending.
If you put the ball back about 1 ball diameter in her stance or move her up by that amount, it will force her to get her back hip around faster to get the barrel on the ball and will accentuate and capture more of the power generated by her hip/hand separation. Her swing is very good, her ideal contact point for that swing would be a bit back.
She’s sweeping them off the tee instead of driving them off the tee.