Seems a little unnecessary, especially since your daughter is in that stage where she is growing very fast and the boots probably won't fit her soon after they're purchased.
My mother always did this, she insisted that I needed special items if, for example, I was taking a short trip with a friend. I would pack my things and when I went to sleep, she would go and repack everything for me and pack items that she deemed important, even though they made my bag heavy. I decided recently to just let her, if it made her feel better if I had extra tissues in my bag (...like five small packs...) I let her have that comfort, I imagine your mom wants the same comfort.
