Gee, none of my students ever showed interest in landing.
You have some time as a CFI, depending on how quickly your student learns, to figure out how he/she learns prior to he/she needing to know how to land.
So, during this time, you need to be figuring out what TYPE of learner your student is. What kind of suggestions to they respond to? Will they "get it" if you show 'em once and then let them practice 10 times? Or is it better to take them each step of the way, telling them exactly where you look, your timing on when to make the required control inputs, etc. Some folks will do the right thing if you tell them, some folks do the right thing if you show them, other if you show & tell...or perhaps show THEN tell...or perhaps show, show then tell and show...get my drift?
My take on this is that you, as the world's greatest/safest pilot and Master-Gold Seal CFI who knows all about flying and the ways of the 172(this is how they see you), need to accumulate a bag-o-tricks and use the appropriate ones when needed.
I'm sure plenty will chime in with their tricks. Ask other CFIs for their tricks when you reach an impass with something and cannot quite figure out how this person is going to get it. Presumably, you know how to land, so simply impart that knowledge on your student using what you know and mathods you've been taught. You'll develop your own style in time as you gain experience (i.e., get bounced down the runway a few times, nearly off the runway another couple, too high/too low others...) and figure out what works and for whom.
Bottom line: never, ever, let a student put you in a situation you can't get out of!