Okay, I get your point now. Thank you for clarifying.
I understand that you'd rather bow out of the discussion, so feel free to ignore my answer, but I feel the need to comment for the OP's sake - your take on this feels so gloomy to me...
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Telling your child that the staging party is a very special thing for the end of the school year or her transition or her first real play or whatever isn't telling her this is the only way a play of hers can ever come alive and it is not telling her there is no point in writing anything again.
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Beyond being a gift, it is showing her exactly one way of bringing this alive, and how the adults involved went about it. A very lavish way that cannot be often repeated, but one that works (I hope!). After this has worked, the OP's daughter can find out about more ways at drama camp, or the OP can help her set up a puppet theater, or she can find a kid-directed drama group in her new school, or she can make new friends in her new class who the next production is just that bit more realistic with with a lot less adult involvement, and she's growing and her needs are changing...
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And the OP has made it clear that this project wasn't ever just a writing project, but always a producing/casting/scenery-creating(costume-making/staging/directing project - the only thing the child not wanting to do being performing herself! And I think it isn't clear yet at all which part of this (if any of course) she will find her passion in. But if she never gets to try it out until she is a grown up and can make everything happen herself...she'd wait too long, I think.