I was also taught the 'push the head, pull the tail' idea and found it worked, though I've seen comments from others who disagree. Do your a/c have HSIs? I find that it is common for pilots to ignore the CDI when using an ADF as they feel it is not showing them anything (ie no nav input) However if set up in conjunction with the desired QDM it helps greatly with situational awareness.
How about, making up a cardboard compass rose (say 12" square) and have the student hold it flat in front of her in the class room. Then, pretend you are the NDB and stand in various places in the room and get her to point her hand at you. She can then see in the real world (vs the PC one) what the needles are doing. She will also be able to see what needs to be done with her heading to get the needle onto the desired QDM. Might work! Good luck
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Another day in paradise