This is likely something highly dependent on her school. When I did Chun Kuk Do, the criteria for uniforms were:
- Clean
- Unwrinkled
- Bearing proper patches (we had specific patches that were required for our organization, and also a list of allowable additional patches)
- Properly tied:
- Uniform ties tied such as to keep the uniform closed without the belt
- Belt not hanging loose
- Belt ends equal length
- Belt tips (electrical tape tips showing that we'd passed interim tests during classes) on the correct side
For competing, we were generally advised to wear a starched heavy uniform for form demonstrations, indeed because it provided a "snap" with punches and kicks, and to wear a lighter-weight "soft" uniform for faster movement, but we were not graded on the type of material or whether it was starched for testing purposes, so I think I wore a heavy uniform for my first two years, and then a soft one for the rest.
Primarily, the uniform should be clean, unwrinkled, and neatly worn (and often this rolls in things like presentation and grooming). Unfortunately, this can be a very subjective thing, and one where my experience is that a lot of biases can creep in, from more well-off students being able to afford more frequent replacements and better cleaning methods to teachers "grading" on things like hair-ties, hairstyles, and whether the the student has bleached or re-dyed their uniform, and not applying those criteria to everyone. Not saying that would be the case for your daughter, but sometimes it is worth pushing back if you're not being provided a reason for a lower rating. Often, when someone is forced to justify their grades, they realize that they're not grading objectively (or in some cases, will inform you of what you're facing, if you find out that they downgraded for things like "ethnic hairstyle" or their reasons clearly weren't applied to other people).