I remember reading an article half a century ago about who are the real heroes in aviation. It's the folk who refuse to accept the 'norm' and conform but push against the tried and trusted and the generally accepted. They often fail but those who succeed lead the way for the rest of us to improve. Of course we want to protect our precious investments to which we have a sentimental attachment but maybe we quietly admire the strength of character that is prepared to go against parental wishes and desires and go ahead and carry 2 wine glasses. I'm only surprised she didn't try and carry 3, just to show you!
There's a lot said about the way in which we teach navigation. Here in the Old Country, we teach how to pre-determine drift and groundspeed to come up with an estimated heading and ETA. We then modify this in the light of what we actually encounter in the air. We are made to use a circular sliderule with a wind triangle device on the other side, no electronics allowed. I once met an instructor who thought this was all rubbish and that we should be teaching people how to feature-crawl and feel the drift from moment to moment. I listened to him for a while and he seemed to be sincere in what he was saying, maybe he was right but I haven't had the courage to break away from our tried and trusted method. I must say that the only times I use a circular slide rule now is when I'm teaching other people how to use it. It's a tablet for me, even IMC on a long multi-waypoint trip around complex airspace.
So, DAR, foster your daughter's independence of spirit, just let her practice on less precious things (pretend to her that they matter more than they really do, or she won't be interested...)
TOO