It�s possible she may have too many decisions for a 5-year old. When there is not enough routine or parameters children can get anxious. This is easy to do with really smart kids.
Anxiousness can look like shutting down, belligerence, indecision, rebellion, and so on.
A five-year old can be shown two or three outfits and given a choice. (In fact some parents don't have them choose.) If she can�t choose don�t buy it. If she is too difficult to shop with bring home outfits and have her choose, but be honest, �what you don�t want goes back to the store.� And for goodness sake buy inexpensive clothes for a selective child. If she doesn't wear it, give it to charity.
Also look at executive functioning. A smart child can look together, but beneath the surface they may need individualized routines for daily living activities. Smart But Scattered addresses this.
And you don�t know how K will go until she tries so try not to worry in front of her or burden her with concerns.
I hope it goes well for both of you.
