sounds like a swing fan is needed, inside back corner, and balance, eyes closed practice for a while.
I'd show them my drills as well.
No clubhead needed until that feels comfortable.
On of my favorites is momentus strength trainer as well. Again, eyes closed, focus on balance and 'seeing' the path of the hands in your mind. The 'par power' is a cheap aid you can pick up off ebay that is useful for this as well, although not as useful as the momentus strength trainer (not bad when combine with a swing jacket though, but there can be issues with the jacket unsupervised)
At this point the ball just 'gets in the way' and the student needs to be able to 'see' what lag is all about, understand the concept of pressure points and work on smooth balanced motion.
Knudsons views, with the 'mind in the hands' variation, if you will.
No club, tossing balls around the green, then on to one handed chips/pitches, right hand only first.