Intonation for Young Double Bass players

[tadams]

I have just joined this forum specifically to find out about intonation issues for young 17 year old Double Bass players.
I am a music teacher and I have to assess a 17 year old girl. I would really like to encourage her by giving her a fantastic mark, because I think she has done a really fantastic job. Her performance did, however have some intonation issues. I would really like to hear from anybody, who could give me some reasons to explain these intonation difficulties as completely typical for someone of this age. The marks I give her will be moderated by an external organisation , so the reasons must be good. She has played repertoire of this assessment all the way up to thumb position.

Looking forward to your reply. Thanks
Terry
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[Peaceful]

I guess that applies to us old'uns who are learning, also. I just ain't seventeen and cute. Any more. Not for a long time. Forty years or so. Still cute though. (HA - who is he kidding?).