I may have missed this, but what exactly is happening during landing (or not landing)? Not being lined up? Not flaring at the right time?

Two things that stuck with me from my student days were:
"Dance with her". Feet and hands always correcting.
"Look at the far end of the runway". Helped alot when knowing when to flare.

Have the student get some sort of reference as to how "high" they are when the plane is on the ground - that might help with SA near the flare.

HTH