I don't think there's much value in telling a child their score. The whole thing is a lot more complicated than a single number, and yet it's easy to get that number into your head and obsess about it, or assign to it more meaning that it really has. DD is aware that she took a test and scored high enough for the gifted program, which she cares about mainly because some of her friends from last year were sent to it this year and she wasn't.
FWIW my personal experience is that I was given an IQ test when I was in 1st grade and sent to my school district's gifted program, too, but I didn't find out my score until I was out of high school and for some reason had needed a copy of my school records, and it was recorded in there. But, while I know the number I don't actually know what test it came from, or the scale of the test, so even as an adult the number is only semi-meaningful as an estimate of how my 7-year-old self was doing one day 30 years ago.
My ex was told his score when he was a kid and believe me, NOTHING good came of him knowing it, and the value he assigned to it was possibly even detrimental to his self-concept.