If your dd went on to go to music college, her technique would be completely taken apart at the start and rebuilt anyway. Of course you can sometimes spot the difference, but lets be honest...professionals spend hours practicing every day, amateur, or those who have other full time jobs and don't work professionally but play for pleasure...don't. So of course they are going to play in a different way, in some cases. I do however know some outrageously brilliant non professional players, who have superb technique.
I would leave the mistake fixing to the teacher! How old is dd? Because if she's only been learning a year or so...you are getting very worked up over nothing!
Sometimes it's easier to change technique when stamina has been built up.. technique develops over time really, so comparing what she's doing to adults is probably pointless.
If she's been learning much longer, and still has poor technique, then perhaps you might need to acknowledge it may not be her thing, or possibly a different teacher!
Hard to say without more info!