Wow, they must start school really late in Nebraska -- my daughter is eight (but will be nine in November) and she's starting fourth grade! Mind you I know they start late in some of the Scandinavian countries, too, and they all end up in the same place by age sixteen (or so the research shows, according to my Danish friends).
Back to clothes. I don't know what your daughter already has, and what she likes to wear. Mine wore only skirts and dresses until grade two, because she said pants were uncomfortable. Now she's discovered jeans with stretch and things have changed.
It also depends on what you want her to wear. Do you want her to blend in with the other kids? Will she care if she stands out? If so, what do they wear? Do you want her to get herself dressed in the morning? Because that sort of thing is easier to do with jeans, or leggings and a tunic than with skirts and tights.
Assuming you're starting from scratch, I would include things like nice jeans, pull-on skirts, cute tights that don't clash with the skirts (kids' clothing can be a riot of pattern and colour, so it's easier to stick to patterned tights and solid skirts or vice versa), a variety of jersey knit pull-on tops, and maybe a simple jersey dress or two. Also, good quality leggings with long tops/tunics are a comfy choice for kids.
Then you need a pair of running shoes for gym class, a pair of boots for snow, a pair of boots for rain, and some maryjanes or ballet flats (or fashion boots or sneakers like Converse -- whatever you prefer).
How about a winter coat? Some cute fall jackets?
Don't forget new undies and socks!
