First, thanks for all your many replies and thoughts on this, suggestions, links etc. They were all much appreciated.
Project is all done now!
Dgd chose the materials she wanted to use after I’d ransacked our house and the local charity shop. First thing she did though, was cut a hole in the dress she was wearing with the children’s scissors I’d got for her
The measuring foxed her (difference between length and width) though didn’t dwell on it.
We made the skirt suggested by gransnetters, and refined on Pinterest, by knotting strips of material onto elastic. Also a scarf from an old net curtain, and we decorated a hat from the charity shop with ribbon and sequins, and it all looks very good and she had a lot of input, and fun.
She was a bit overwhelmed after we read her instructions from school, especially the word ‘evaluation’ and was worried that if she did anything wrong she’d have to do it all again.
Dil helped her with the drawing and writing bits, sketch, brainstorming, evaluation and poster.
I had to make sure it was fun for her though, and just do it a bit at a time. It was way too complex to do it on her own, but did really well with a bit (a lot?) of prompting. She’s not an anxious child, but I did feel she might have got worried about it, partly because she just didn’t understand the flyer from school and knew it was too much for her by herself.
For that reason and the fact that dil and I had to help so much, I will ask dil to have a quiet word with school and point that out.
Dgd is happy with it all though. Just the fashion show to go. Fingers crossed it doesn’t all fall apart before then!