Sometimes... .I just don't get it.
It's frustrating.
You're trying to rationalize this for her by sending her a list of who has what. It's the hardest part of this - you can't neutralize this by showing her that she's wrong. Or by coming up with solutions that won't work - like sending her to school naked.
How else can you bring resolution to the problem?
Can more uniforms be purchased so that she has more then enough?
Is there even a problem?
Maybe mom is having a bad day?
Also, a rule of thumb in stepfamilies is that the kids' clothes are
their clothes. Not Mom's. Not Dad's. I wouldn't get in the habit of deeming "Mom's clothes" or "our clothes" - it puts a lot of stress on the kiddo to make sure which clothes goes where. Studies have showed just how much the kids struggled with that kind of polarization.
-DG